Game plan
Serena Williams v Bianca Andreescu
Every number combines what Serena Williams does well with what Bianca Andreescu allows, each measured against the tour average and shrunk toward it when the sample is thin. Flip perspective
Forecast
Each player's serve and return strength is fitted against every opponent they were charted against, so a record built on weak opponents counts for less. At least one of them is no longer active or has too little charted in the last three seasons, so both are compared on their careers. The result is then nudged by Serena Williams's record against Bianca Andreescu's tactical lookalikes and in their charted head-to-heads (lookalikes: +14.4 on serve, −3.0 on return vs expectation (91 points); head-to-head: −13.6 on serve, −1.9 on return vs expectation (173 points)). A game-by-game Markov chain turns point odds into match odds; the 90% range covers the uncertainty in the two strengths, not the nudges. Charted matches lean toward big events, so treat this as a scouting estimate, not a betting line.
Head to head, per 100 shots
| Career | Serena | Bianca |
|---|---|---|
| Direction choice | +0.34 ±0.04 better than 97% | −0.35 ±0.03 better than 4% |
| Shot selection | +0.47 ±0.05 better than 93% | −0.08 ±0.07 better than 36% |
| Execution | −0.04 ±0.27 better than 59% | −0.56 ±0.16 better than 31% |
| Points left on the table | 2.20 ±0.07 lower than 94% | 3.03 ±0.04 lower than 10% |
Each player's career against an average tour player in the same position, adjusted for opponent strength, with a 90% margin (shots clustered by match). Points left on the table is the gap to the best-value direction for the same stroke, so lower is better. Percentiles are within each player's own tour. A side is highlighted only when the gap is larger than the margin on the difference.
Structural compatibility
Expected edge per 100 rally shots from style alone: Serena Williams −1.70, Bianca Andreescu −0.56. Each player's shot mix weighted by their own skill with each shot and by how much the other gives up against it. This is why some rankings gaps don't hold in a given matchup.
Serve plan
The share of points the server wins when a first serve lands in that direction (hover a rate for its 90% interval; ± is the 90% margin). "Matchup" combines the server's rate with how this returner handles that serve. "Optimal" is the mix that wins most against this returner once they start reading a habit, at the response measured across the tour, and only within the range servers' habits actually vary. The gain over the current mix is how exploitable that mix is.
Serena Williams serving
Deuce court
| 1st serve | Now | Serena wins | v Bianca | Matchup | Optimal |
|---|---|---|---|---|---|
| Wide | 50% | 70% | 68% | 71.7%±2.5 | 65% ▲ |
| Body | 8% | 62% | 56% | 61.1%±5.0 | 0% ▼ |
| T | 42% | 79% | 66% | 77.8%±2.5 | 35% ▼ |
Optimal v Bianca Andreescu: +0.7±0.5 per 100 first serves (faults included) over the current mix. Serving T every time would read +4.4 per 100 first serves in before the returner adjusts.
Ad court
| 1st serve | Now | Serena wins | v Bianca | Matchup | Optimal |
|---|---|---|---|---|---|
| Wide | 45% | 75% | 68% | 77.1%±2.5 | 60% ▲ |
| Body | 6% | 60% | 57% | 61.2%±5.7 | 0% ▼ |
| T | 49% | 70% | 64% | 69.7%±2.7 | 40% ▼ |
Optimal v Bianca Andreescu: +0.4±0.4 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +4.6 per 100 first serves in before the returner adjusts.
Bianca Andreescu serving
Deuce court
| 1st serve | Now | Bianca wins | v Serena | Matchup | Optimal |
|---|---|---|---|---|---|
| Wide | 38% | 67% | 65% | 65.7%±2.8 | 53% ▲ |
| Body | 30% | 59% | 53% | 54.8%±3.5 | 14% ▼ |
| T | 32% | 72% | 66% | 70.0%±2.9 | 33% |
Optimal v Serena Williams: +1.2±0.5 per 100 first serves (faults included) over the current mix. Serving T every time would read +6.2 per 100 first serves in before the returner adjusts.
Ad court
| 1st serve | Now | Bianca wins | v Serena | Matchup | Optimal |
|---|---|---|---|---|---|
| Wide | 39% | 67% | 66% | 67.0%±3.0 | 54% ▲ |
| Body | 27% | 57% | 57% | 58.4%±3.8 | 27% |
| T | 34% | 65% | 61% | 61.6%±3.1 | 19% ▼ |
Optimal v Serena Williams: +0.3±0.5 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +4.2 per 100 first serves in before the returner adjusts.
Return plan
Value of each return, in points per 100 returns against an average return of the same serve (direction, court, surface): the tour's result with that return, the returner's own edge with it, and what this server gives up when it comes back to that side. Returns with no charted direction are left out, so values compare with each other rather than with zero. Depth isn't a choice here: missed returns have no depth. Serve quality isn't charted, so a block through the middle partly reflects the serve that forced it.
Serena Williams returning
1st serve to the forehand
| Return | Now | Tour | Own | v Bianca | Value |
|---|---|---|---|---|---|
| FH through the middle | 49% | +4.2 | −2.6 | −0.4 | +1.1±1.2 |
| FH crosscourt | 36% | +5.3 | −1.6 | −0.7 | +3.0±2.1 |
| FH down the line | 11% | +1.5 | −0.4 | −2.0 | −0.8±3.0 |
| BH through the middle | 1% | +5.2 | −3.4 | −0.9 | +0.9±2.1 |
| FH slice through the middle | 1% | −6.7 | −0.7 | +0.2 | −7.2±1.9 |
Lean FH crosscourt: +1.5±1.5 per 100 returns v the current mix (2166 returns charted)
1st serve to the backhand
| Return | Now | Tour | Own | v Bianca | Value |
|---|---|---|---|---|---|
| BH through the middle | 48% | +6.0 | +0.3 | −0.9 | +5.4±1.1 |
| BH crosscourt | 33% | +7.7 | +1.3 | −1.2 | +7.9±1.8 |
| BH down the line | 12% | +2.2 | +1.1 | −4.7 | −1.5±3.1 |
| BH slice through the middle | 3% | −6.2 | −4.5 | +0.1 | −10.6±2.3 |
| BH slice crosscourt | 2% | −4.2 | −2.8 | −4.8 | −11.7±2.9 |
Lean BH crosscourt: +3.5±1.3 per 100 returns v the current mix (1939 returns charted)
2nd serve to the forehand
| Return | Now | Tour | Own | v Bianca | Value |
|---|---|---|---|---|---|
| FH crosscourt | 43% | +0.5 | −0.5 | −3.4 | −3.4±2.9 |
| FH through the middle | 37% | −3.2 | −0.1 | −0.5 | −3.7±1.9 |
| FH down the line | 18% | −0.6 | +5.3 | −0.7 | +4.1±4.2 |
| BH inside-in | 1% | +2.0 | −1.4 | −1.4 | −0.9±2.5 |
| BH through the middle | 1% | −1.0 | −0.2 | −0.8 | −2.0±1.5 |
Lean FH down the line: +6.2±3.8 per 100 returns v the current mix (750 returns charted)
2nd serve to the backhand
| Return | Now | Tour | Own | v Bianca | Value |
|---|---|---|---|---|---|
| BH crosscourt | 51% | +1.5 | +0.9 | −1.4 | +0.9±1.9 |
| BH through the middle | 30% | −2.6 | −1.8 | −0.8 | −5.2±1.6 |
| BH down the line | 17% | −0.5 | +3.4 | −3.0 | −0.2±3.8 |
| FH inside-in | 1% | +0.7 | +0.7 | −3.4 | −2.0±3.1 |
| FH inside-out | 1% | +1.4 | +0.2 | −0.7 | +0.9±3.0 |
Lean BH crosscourt: +2.1±1.2 per 100 returns v the current mix (954 returns charted)
Bianca Andreescu returning
1st serve to the forehand
| Return | Now | Tour | Own | v Serena | Value |
|---|---|---|---|---|---|
| FH through the middle | 51% | +4.2 | +0.7 | −1.3 | +3.6±1.2 |
| FH down the line | 16% | +1.5 | −3.9 | −1.4 | −3.9±2.9 |
| FH slice through the middle | 13% | −6.7 | −1.5 | +2.1 | −6.1±1.8 |
| FH crosscourt | 13% | +5.3 | −2.7 | −4.0 | −1.4±2.7 |
| FH slice crosscourt | 4% | −6.6 | −3.1 | −2.4 | −12.1±2.7 |
Lean FH through the middle: +4.1±0.9 per 100 returns v the current mix (2739 returns charted)
1st serve to the backhand
| Return | Now | Tour | Own | v Serena | Value |
|---|---|---|---|---|---|
| BH through the middle | 55% | +6.0 | −0.2 | −1.0 | +4.9±1.2 |
| BH crosscourt | 17% | +7.7 | −1.3 | −0.2 | +6.2±2.3 |
| BH down the line | 16% | +2.2 | +0.1 | −4.1 | −1.8±3.1 |
| BH slice through the middle | 7% | −6.2 | −3.5 | −0.2 | −10.0±2.0 |
| BH slice crosscourt | 3% | −4.2 | −3.7 | −2.8 | −10.7±2.9 |
Lean BH crosscourt: +4.2±2.1 per 100 returns v the current mix (2846 returns charted)
2nd serve to the forehand
| Return | Now | Tour | Own | v Serena | Value |
|---|---|---|---|---|---|
| FH through the middle | 51% | −3.2 | +0.2 | −0.9 | −3.9±1.9 |
| FH down the line | 21% | −0.6 | +0.8 | +0.6 | +0.8±4.1 |
| FH crosscourt | 19% | +0.5 | +0.9 | −3.0 | −1.6±3.5 |
| FH slice through the middle | 6% | −15.2 | −1.0 | −0.4 | −16.6±2.4 |
| FH slice crosscourt | 2% | −14.9 | −1.6 | ±0.0 | −16.6±2.4 |
Lean FH down the line: +4.4±3.5 per 100 returns v the current mix (778 returns charted)
2nd serve to the backhand
| Return | Now | Tour | Own | v Serena | Value |
|---|---|---|---|---|---|
| BH through the middle | 48% | −2.6 | +0.1 | −0.3 | −2.8±1.3 |
| BH crosscourt | 20% | +1.5 | −1.1 | −0.2 | +0.1±2.3 |
| BH down the line | 19% | −0.5 | +1.7 | −2.1 | −0.9±3.6 |
| FH through the middle | 5% | −2.7 | +1.6 | −0.9 | −2.0±2.1 |
| FH inside-out | 3% | +1.4 | −1.1 | +0.6 | +0.8±3.8 |
Lean FH inside-out: +2.5±3.8 per 100 returns v the current mix (1462 returns charted, inside the 90% margin)
Rally plan
Edge, in points per 100 shots: the hitter's skill with the shot (own) plus how much the receiver usually gives up against it (theirs), both measured against the tour average.
Serena Williams
Favour
| Shot | Edge | Own | Theirs |
|---|---|---|---|
| Smash to their backhand · rally | +2.3±5.2 | +0.7 | +1.6 |
| Smash to their forehand · rally | +2.1±5.1 | −0.2 | +2.3 |
| FH to their backhand · return | +1.4±2.1 | +2.9 | −1.4 |
| FH to their backhand · serve +1 | +0.8±1.8 | +2.6 | −1.8 |
| FH to their forehand · serve +1 | +0.2±1.6 | +1.4 | −1.2 |
| BH to their backhand · return | −0.2±1.2 | +1.1 | −1.3 |
Avoid
| Shot | Edge | Own | Theirs |
|---|---|---|---|
| BH slice to their forehand · rally | −9.2±3.2 | −4.5 | −4.7 |
| BH slice to their backhand · rally | −6.5±2.2 | −2.9 | −3.7 |
| BH slice to the middle · return | −5.3±2.2 | −4.9 | −0.5 |
| FH to their forehand · return +1 | −3.9±1.6 | −3.0 | −0.9 |
| BH slice to the middle · rally | −3.8±1.7 | −2.3 | −1.6 |
Bianca Andreescu
Favour
| Shot | Edge | Own | Theirs |
|---|---|---|---|
| FH volley to their backhand · rally | +6.5±5.1 | +1.5 | +5.0 |
| FH volley to their forehand · rally | +4.5±4.8 | +3.7 | +0.8 |
| BH lob to their backhand · rally | +2.6±3.9 | −2.3 | +4.9 |
| FH to their forehand · return +1 | +2.3±1.8 | +0.8 | +1.6 |
| BH to their backhand · return +1 | +1.9±1.8 | −0.2 | +2.0 |
| BH to their backhand · serve +1 | +1.8±1.7 | +1.5 | +0.3 |
Avoid
| Shot | Edge | Own | Theirs |
|---|---|---|---|
| BH slice to their forehand · return | −6.4±3.4 | −4.8 | −1.6 |
| BH slice to their backhand · return | −6.0±2.9 | −3.1 | −2.9 |
| FH slice to their forehand · return | −5.3±2.6 | −3.1 | −2.3 |
| FH to their forehand · return | −4.8±2.0 | −1.2 | −3.6 |
| BH slice to their forehand · rally | −4.0±2.8 | −4.1 | ±0.0 |
Against Bianca Andreescu-like opponents
| Serena Williams v | Matches | Serve pts won | Return pts won |
|---|---|---|---|
| All charted opponents | – | 62.1% | 45.1% |
| Players most similar to Bianca Andreescu | 1 | 78.3% | 44.4% |
| Bianca Andreescu (charted head-to-head) | 2 | 49.5% | 42.5% |
Similar by tactical fingerprint: Cristina Bucsa, Karolina Muchova, Xin Yu Wang, Marta Kostyuk, Jasmine Paolini, Nadia Podoroska, Nao Hibino, Irina Camelia Begu, R, Andrea Petkovic. When two players have rarely met, their records against these lookalikes fill the gap.