Game plan

Leylah Fernandez v Diana Shnaider

Every number combines what Leylah Fernandez does well with what Diana Shnaider allows, each measured against the tour average and shrunk toward it when the sample is thin. Flip perspective

Forecast

Leylah Fernandez wins, best of 3 55%90%: 34%–76% · best of 5: 57%

Serve points won 60.5% / 59.4% Leylah / Diana · tour 56.7%

Strengths only, no similarity priors 57%serve 60.6% / 59.3%

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. Both were charted enough in the last three seasons, so those carry the most weight. The result is then nudged by Leylah Fernandez's record against Diana Shnaider's tactical lookalikes and in their charted head-to-heads (lookalikes: −4.9 on serve, −10.8 on return vs expectation (140 points); head-to-head: +1.4 on serve, +1.9 on return vs expectation (451 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	Leylah	Diana
Direction choice	−0.17 ±0.06 better than 23%	−0.09 ±0.05 better than 36%
Shot selection	+0.22 ±0.11 better than 69%	−0.15 ±0.14 better than 31%
Execution	+0.34 ±0.42 better than 74%	+0.13 ±0.41 better than 67%
Points left on the table	3.33 ±0.10 lower than 3%	3.07 ±0.10 lower than 8%

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: Leylah Fernandez +0.51, Diana Shnaider +0.79. 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.

Leylah Fernandez serving

Deuce court

1st serve	Now	Leylah wins	v Diana	Matchup	Optimal
Wide	35%	69%	67%	70.5%±5.1	51% ▲
Body	19%	57%	65%	63.8%±7.9	4% ▼
T	45%	64%	71%	67.9%±5.9	45%

Optimal v Diana Shnaider: +0.7±0.9 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +2.5 per 100 first serves in before the returner adjusts.

Ad court

1st serve	Now	Leylah wins	v Diana	Matchup	Optimal
Wide	54%	69%	71%	73.6%±5.0	69% ▲
Body	16%	55%	60%	58.6%±8.4	1% ▼
T	30%	71%	66%	72.4%±5.7	30%

Optimal v Diana Shnaider: +0.6±0.9 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +2.7 per 100 first serves in before the returner adjusts.

Diana Shnaider serving

Deuce court

1st serve	Now	Diana wins	v Leylah	Matchup	Optimal
Wide	28%	67%	67%	68.1%±5.7	43% ▲
Body	33%	61%	58%	61.5%±6.2	18% ▼
T	39%	62%	69%	63.7%±5.9	39%

Optimal v Leylah Fernandez: +0.3±0.9 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +3.9 per 100 first serves in before the returner adjusts.

Ad court

1st serve	Now	Diana wins	v Leylah	Matchup	Optimal
Wide	46%	65%	69%	69.1%±5.1	51% ▲
Body	23%	62%	53%	58.2%±7.7	8% ▼
T	31%	68%	66%	69.9%±5.7	41% ▲

Optimal v Leylah Fernandez: +1.2±0.9 per 100 first serves (faults included) over the current mix. Serving T every time would read +3.2 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.

Leylah Fernandez returning

1st serve to the forehand

Return	Now	Tour	Own	v Diana	Value
FH through the middle	48%	+4.2	+2.6	−0.4	+6.4±2.2
FH crosscourt	29%	+5.3	+1.3	−6.0	+0.6±3.9
FH down the line	20%	+1.5	−3.0	−0.3	−1.8±4.2
FH slice through the middle	2%	−6.7	−0.4	+0.1	−7.1±2.3
FH slice down the line	1%	−10.5	−1.0	+1.5	−10.0±2.7

Lean FH through the middle: +3.7±1.8 per 100 returns v the current mix (626 returns charted)

1st serve to the backhand

Return	Now	Tour	Own	v Diana	Value
BH through the middle	45%	+6.0	−1.6	+1.2	+5.7±1.8
BH crosscourt	24%	+7.7	+0.7	−1.8	+6.6±3.0
BH down the line	11%	+2.2	−1.0	+1.1	+2.2±4.2
BH slice through the middle	10%	−6.2	−0.3	−0.8	−7.3±2.5
BH slice crosscourt	6%	−4.2	−1.9	+1.1	−4.9±2.8

Lean BH crosscourt: +4.0±2.5 per 100 returns v the current mix (845 returns charted)

2nd serve to the forehand

Return	Now	Tour	Own	v Diana	Value
FH crosscourt	44%	+0.5	±0.0	−3.9	−3.4±4.4
FH through the middle	39%	−3.2	+3.1	+1.9	+1.8±2.9
FH down the line	17%	−0.6	+0.6	+0.5	+0.5±5.2

Lean FH through the middle: +2.5±2.8 per 100 returns v the current mix (186 returns charted, inside the 90% margin)

2nd serve to the backhand

Return	Now	Tour	Own	v Diana	Value
BH through the middle	45%	−2.6	+1.0	+3.1	+1.5±2.2
BH crosscourt	34%	+1.5	±0.0	−1.3	+0.2±3.4
BH down the line	15%	−0.5	+1.5	−1.8	−0.9±4.8
FH through the middle	3%	−2.7	+0.1	+1.9	−0.6±2.2
BH slice through the middle	1%	−11.7	−0.9	+0.8	−11.8±1.8

Lean BH through the middle: +1.0±1.8 per 100 returns v the current mix (406 returns charted, inside the 90% margin)

Diana Shnaider returning

1st serve to the forehand

Return	Now	Tour	Own	v Leylah	Value
FH through the middle	45%	+4.2	+0.7	±0.0	+4.9±2.4
FH crosscourt	26%	+5.3	−0.8	−1.5	+3.1±4.0
FH slice through the middle	12%	−6.7	±0.0	−0.5	−7.2±2.6
FH down the line	8%	+1.5	−0.7	+0.9	+1.8±4.4
FH slice crosscourt	7%	−6.6	+0.6	−1.2	−7.2±2.6

Lean FH through the middle: +3.3±1.7 per 100 returns v the current mix (390 returns charted)

1st serve to the backhand

Return	Now	Tour	Own	v Leylah	Value
BH through the middle	39%	+6.0	−0.4	+1.2	+6.8±1.9
BH slice through the middle	19%	−6.2	+1.1	−1.7	−6.9±2.4
BH crosscourt	18%	+7.7	−2.2	−3.0	+2.6±3.2
BH down the line	12%	+2.2	+3.2	+2.6	+8.0±4.1
BH slice crosscourt	6%	−4.2	−0.9	−1.0	−6.0±3.0

Lean BH down the line: +6.4±3.8 per 100 returns v the current mix (685 returns charted)

2nd serve to the forehand

Return	Now	Tour	Own	v Leylah	Value
FH crosscourt	48%	+0.5	+2.1	−4.7	−2.0±4.3
FH through the middle	37%	−3.2	−1.1	+0.2	−4.1±2.8
FH down the line	15%	−0.6	−0.7	−0.3	−1.6±4.8

Lean FH crosscourt: +0.7±2.6 per 100 returns v the current mix (93 returns charted, inside the 90% margin)

2nd serve to the backhand

Return	Now	Tour	Own	v Leylah	Value
BH through the middle	53%	−2.6	+1.9	+1.7	+1.0±2.1
BH crosscourt	33%	+1.5	+0.5	−2.0	±0.0±3.3
BH down the line	10%	−0.5	+0.4	−2.1	−2.2±5.0
BH slice through the middle	2%	−11.7	−0.3	+0.8	−11.1±1.8
FH through the middle	1%	−2.7	+0.1	+0.2	−2.3±1.9

Lean BH through the middle: +0.9±1.6 per 100 returns v the current mix (429 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 on hard. Each player's hard record is shrunk toward their all-surface one, so a thin sample on it moves the numbers only a little.