RallyIQ

Game plan

Caroline Wozniacki v Na Li

Every number combines what Caroline Wozniacki does well with what Na Li allows, each measured against the tour average and shrunk toward it when the sample is thin. Flip perspective

Forecast

Caroline Wozniacki wins, best of 3 72%90%: 43%–91% · best of 5: 77%
Serve points won 58.3% / 53.8% Caroline / Na · tour 56.3%
Strengths only, no similarity priors 66%serve 58.2% / 55.1%

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 At least one of them is no longer active or has too little charted in the last three seasons, so both are compared on their careers.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 Caroline Wozniacki's record against Na Li's tactical lookalikes and in their charted head-to-heads (lookalikes: +1.1 on serve, +3.6 on return vs expectation (1800 points); head-to-head: −5.1 on serve, −0.4 on return vs expectation (199 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

CareerCarolineNa
Direction choice+0.03 ±0.05
better than 59%
+0.21 ±0.11
better than 85%
Shot selection+0.06 ±0.06
better than 52%
+0.55 ±0.15
better than 95%
Execution+2.22 ±0.16
better than 100%
−0.31 ±0.59
better than 44%
Points left on the table2.40 ±0.07
lower than 76%
2.18 ±0.16
lower than 95%

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.

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.

Caroline Wozniacki serving

Deuce court

1st serveNowCaroline winsv NaMatchupOptimal
Wide42%67%71%72.2%±5.457% ▲
Body25%62%54%58.9%±8.210% ▼
T33%71%63%65.9%±7.333%

Optimal v Na Li: +0.7±0.9 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +5.5 per 100 first serves in before the returner adjusts.

Ad court

1st serveNowCaroline winsv NaMatchupOptimal
Wide35%68%70%72.3%±6.648% ▲
Body24%59%53%56.0%±9.29% ▼
T41%63%65%64.2%±6.443% ▲

Optimal v Na Li: +0.8±0.9 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +7.2 per 100 first serves in before the returner adjusts.

Na Li serving

Deuce court

1st serveNowNa winsv CarolineMatchupOptimal
Wide42%62%60%56.2%±6.445% ▲
Body18%58%50%50.9%±8.83% ▼
T40%66%63%60.8%±6.952% ▲

Optimal v Caroline Wozniacki: +0.7±0.9 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving T every time would read +3.8 per 100 first serves in before the returner adjusts.

Ad court

1st serveNowNa winsv CarolineMatchupOptimal
Wide32%69%60%64.3%±7.447% ▲
Body6%61%47%52.2%±12.40% ▼
T62%64%59%57.7%±5.753% ▼

Optimal v Caroline Wozniacki: +1.0±0.8 per 100 first serves (faults included) over the current mix. Serving wide every time would read +4.8 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.

Caroline Wozniacki returning

1st serve to the forehand

ReturnNowTourOwnv NaValue
FH through the middle52%+4.2+3.4+0.7+8.2±2.1
FH crosscourt21%+5.3+3.9+1.7+11.0±3.3
FH down the line16%+1.5+6.2−0.6+7.1±3.9
FH slice through the middle7%−6.7−1.5+0.1−8.2±2.2
FH slice crosscourt2%−6.6−1.7+0.8−7.6±2.6

Lean FH crosscourt: +4.1±2.9 per 100 returns v the current mix (2852 returns charted)

1st serve to the backhand

ReturnNowTourOwnv NaValue
BH through the middle45%+6.0+2.8+2.1+10.9±2.1
BH crosscourt36%+7.7+4.0+2.3+14.0±2.8
BH slice through the middle9%−6.2−1.9−0.6−8.7±2.3
BH down the line5%+2.2+5.0−0.1+7.0±4.6
BH slice down the line3%−12.5−2.1−1.9−16.4±3.0

Lean BH crosscourt: +5.1±2.1 per 100 returns v the current mix (1809 returns charted)

2nd serve to the forehand

ReturnNowTourOwnv NaValue
FH through the middle43%−3.2+3.7+0.7+1.2±2.5
FH down the line29%−0.6+2.5+2.4+4.4±4.3
FH crosscourt26%+0.5+3.0−1.0+2.6±3.8
BH inside-out1%+2.2+0.3−1.0+1.5±3.8
BH through the middle1%−1.0−0.3−0.6−1.8±2.0

Lean FH down the line: +2.1±3.4 per 100 returns v the current mix (983 returns charted, inside the 90% margin)

2nd serve to the backhand

ReturnNowTourOwnv NaValue
BH crosscourt54%+1.5+3.5±0.0+5.0±2.9
BH through the middle35%−2.6+4.1−0.6+1.0±2.4
BH down the line12%−0.5+2.0−1.0+0.4±5.1

Lean BH crosscourt: +1.9±1.7 per 100 returns v the current mix (834 returns charted)

Na Li returning

1st serve to the forehand

ReturnNowTourOwnv CarolineValue
FH through the middle51%+4.2−2.7+0.9+2.3±2.1
FH down the line27%+1.5−0.7+3.6+4.4±3.7
FH crosscourt18%+5.3−4.6+1.4+2.1±3.4
FH slice down the line2%−10.5−0.2−1.3−12.0±2.9
FH slice through the middle2%−6.7−1.4+0.3−7.8±1.8

Lean FH down the line: +2.0±3.0 per 100 returns v the current mix (292 returns charted, inside the 90% margin)

1st serve to the backhand

ReturnNowTourOwnv CarolineValue
BH through the middle41%+6.0−0.6±0.0+5.4±2.2
BH crosscourt35%+7.7−2.0+1.2+7.0±2.9
BH down the line8%+2.2−0.9−1.1+0.1±3.3
BH slice through the middle7%−6.2+0.3−1.3−7.3±2.0
BH slice crosscourt6%−4.2−2.5−0.1−6.8±2.6

Lean BH crosscourt: +3.1±2.1 per 100 returns v the current mix (167 returns charted)

2nd serve to the forehand

ReturnNowTourOwnv CarolineValue
FH through the middle39%−3.2−2.2+1.8−3.6±2.4
FH crosscourt31%+0.5−2.8+0.8−1.5±3.5
FH down the line30%−0.6+0.3+1.5+1.3±4.2

Lean FH down the line: +2.7±3.3 per 100 returns v the current mix (80 returns charted, inside the 90% margin)

2nd serve to the backhand

ReturnNowTourOwnv CarolineValue
BH crosscourt53%+1.5−1.6+0.3+0.2±3.0
BH through the middle37%−2.6−1.7+1.8−2.5±2.3
BH down the line10%−0.5+0.4+2.9+2.7±3.8

Lean BH crosscourt: +0.7±1.7 per 100 returns v the current mix (115 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.

Caroline Wozniacki

Favour

ShotEdgeOwnTheirs
FH to the middle · return+6.2±1.9+4.2+2.0
FH to their forehand · return+6.0±3.2+4.1+1.9
FH to their backhand · serve +1+5.4±3.2+1.2+4.1
FH to their backhand · return+4.5±3.4+3.6+0.9
BH to their backhand · return+4.4±2.3+3.4+1.0
FH to their backhand · return +1+4.2±3.4+3.1+1.1

Avoid

ShotEdgeOwnTheirs
FH to their forehand · return +1−2.5±2.8+1.4−4.0
FH to their forehand · rally+0.2±1.8+1.7−1.5
BH to the middle · serve +1+0.8±1.9+2.1−1.3
FH to their forehand · serve +1+1.5±3.1+1.3+0.2
FH to their backhand · rally+1.8±2.6+2.9−1.0

Na Li

Favour

ShotEdgeOwnTheirs
FH to their backhand · serve +1+3.4±3.2+0.4+3.0
FH to their backhand · rally+3.0±2.3+1.6+1.4
FH to their backhand · return+2.5±3.2−0.3+2.8
BH to their backhand · serve +1+2.2±2.6+1.5+0.7
FH to the middle · serve +1+1.4±2.1±0.0+1.4
BH to the middle · serve +1+1.2±2.0−0.3+1.5

Avoid

ShotEdgeOwnTheirs
FH to their forehand · return−3.4±3.2−4.6+1.2
FH to their forehand · return +1−2.2±2.9−2.1−0.1
BH to their backhand · return−2.1±2.6−3.1+0.9
BH to their forehand · rally−1.5±3.0−1.4−0.1
BH to the middle · return +1−1.2±2.0−2.0+0.8

Against Na Li-like opponents

Caroline Wozniacki vMatchesServe pts wonReturn pts won
All charted opponents–59.8%48.8%
Players most similar to Na Li14 58.9%49.2%
Na Li (charted head-to-head)1 53.1%44.6%

Similar by tactical fingerprint: Naomi Osaka, Ashlyn Krueger, Belinda Bencic, Rebecca Sramkova, Shuai Zhang, Katerina Siniakova, Venus Williams, Qiang Wang, Maria Sharapova, Lindsay Davenport. When two players have rarely met, their records against these lookalikes fill the gap.

Charted head-to-head