RallyIQ

Game plan

Na Li v Maria Sharapova

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

Forecast

Na Li wins, best of 3 45%90%: 18%–74% · best of 5: 43%
Serve points won 57.1% / 58.1% Na / Maria · tour 55.0%
Strengths only, no similarity priors 42%serve 57.0% / 58.5%

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 At least one of them is no longer active or has too little charted in the last three seasons, so both are compared on their careers.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 Na Li's record against Maria Sharapova's tactical lookalikes and in their charted head-to-heads (head-to-head: +1.2 on serve, +3.8 on return vs expectation (361 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

CareerNaMaria
Direction choice+0.21 ±0.11
better than 85%
+0.20 ±0.04
better than 85%
Shot selection+0.55 ±0.15
better than 95%
+0.35 ±0.06
better than 83%
Execution−0.31 ±0.59
better than 44%
−0.22 ±0.24
better than 47%
Points left on the table2.18 ±0.16
lower than 95%
2.22 ±0.05
lower than 92%

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.

Na Li serving

Deuce court

1st serveNowNa winsv MariaMatchupOptimal
Wide42%62%62%57.7%±6.545% ▲
Body18%58%55%55.8%±8.83% ▼
T40%66%68%66.2%±6.552% ▲

Optimal v Maria Sharapova: +0.5±0.9 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving T every time would read +5.5 per 100 first serves in before the returner adjusts.

Ad court

1st serveNowNa winsv MariaMatchupOptimal
Wide32%69%67%70.8%±6.847% ▲
Body6%61%54%58.4%±12.20% ▼
T62%64%64%62.7%±5.653% ▼

Optimal v Maria Sharapova: +1.2±0.8 per 100 first serves (faults included) over the current mix. Serving wide every time would read +5.7 per 100 first serves in before the returner adjusts.

Maria Sharapova serving

Deuce court

1st serveNowMaria winsv NaMatchupOptimal
Wide48%69%71%73.8%±5.357% ▲
Body16%60%54%57.2%±8.61% ▼
T36%74%63%69.1%±7.142% ▲

Optimal v Na Li: +0.8±0.8 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +4.4 per 100 first serves in before the returner adjusts.

Ad court

1st serveNowMaria winsv NaMatchupOptimal
Wide33%69%70%73.1%±6.629% ▼
Body10%57%53%53.9%±9.90% ▼
T56%68%65%68.7%±6.071% ▲

Optimal v Na Li: +0.7±0.8 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +4.5 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.

Na Li returning

1st serve to the forehand

ReturnNowTourOwnv MariaValue
FH through the middle51%+4.2−2.7−0.6+0.8±2.1
FH down the line27%+1.5−0.7+0.8+1.6±3.9
FH crosscourt18%+5.3−4.6−1.7−0.9±3.5
FH slice down the line2%−10.5−0.2−1.7−12.4±2.7
FH slice through the middle2%−6.7−1.4−1.5−9.6±2.0

Lean FH down the line: +1.4±3.1 per 100 returns v the current mix (292 returns charted, inside the 90% margin)

1st serve to the backhand

ReturnNowTourOwnv MariaValue
BH through the middle41%+6.0−0.6−0.7+4.7±2.3
BH crosscourt35%+7.7−2.0+0.3+6.1±3.0
BH down the line8%+2.2−0.9+0.5+1.8±3.7
BH slice through the middle7%−6.2+0.3+0.6−5.3±2.0
BH slice crosscourt6%−4.2−2.5+1.9−4.8±2.6

Lean BH crosscourt: +2.4±2.2 per 100 returns v the current mix (167 returns charted)

2nd serve to the forehand

ReturnNowTourOwnv MariaValue
FH through the middle39%−3.2−2.2−0.7−6.1±2.5
FH crosscourt31%+0.5−2.8−5.5−7.8±3.7
FH down the line30%−0.6+0.3+1.7+1.4±4.6

Lean FH down the line: +5.8±3.5 per 100 returns v the current mix (80 returns charted)

2nd serve to the backhand

ReturnNowTourOwnv MariaValue
BH crosscourt53%+1.5−1.6−0.4−0.5±3.0
BH through the middle37%−2.6−1.7−1.7−6.0±2.2
BH down the line10%−0.5+0.4−1.2−1.3±4.2

Lean BH crosscourt: +2.1±1.7 per 100 returns v the current mix (115 returns charted)

Maria Sharapova returning

1st serve to the forehand

ReturnNowTourOwnv NaValue
FH through the middle47%+4.2−1.0+0.7+3.9±2.2
FH crosscourt26%+5.3−0.9+1.7+6.2±3.4
FH down the line20%+1.5−0.9−0.6±0.0±4.0
FH slice through the middle4%−6.7−2.2+0.1−8.9±2.5
FH slice crosscourt2%−6.6−4.7+0.8−10.5±2.6

Lean FH crosscourt: +3.3±2.8 per 100 returns v the current mix (1904 returns charted)

1st serve to the backhand

ReturnNowTourOwnv NaValue
BH through the middle48%+6.0−1.4+2.1+6.7±2.1
BH crosscourt30%+7.7−2.3+2.3+7.7±3.0
BH down the line13%+2.2+2.8−0.1+4.8±4.2
BH slice through the middle4%−6.2−2.4−0.6−9.3±2.4
BH slice crosscourt2%−4.2−3.5−0.3−8.0±2.6

Lean BH crosscourt: +2.3±2.4 per 100 returns v the current mix (1509 returns charted, inside the 90% margin)

2nd serve to the forehand

ReturnNowTourOwnv NaValue
FH through the middle42%−3.2+2.0+0.7−0.5±2.6
FH crosscourt31%+0.5±0.0−1.0−0.4±4.0
FH down the line25%−0.6−2.1+2.4−0.3±4.6
FH slice crosscourt1%−14.9−0.1±0.0−14.9±1.3
FH slice through the middle1%−15.2−0.2±0.0−15.4±1.1

Lean FH down the line: +0.4±3.8 per 100 returns v the current mix (602 returns charted, inside the 90% margin)

2nd serve to the backhand

ReturnNowTourOwnv NaValue
BH through the middle40%−2.6−1.7−0.6−4.8±2.3
BH crosscourt39%+1.5−0.8±0.0+0.7±3.0
BH down the line13%−0.5+3.1−1.0+1.5±5.1
FH inside-in3%+0.7+1.5−1.0+1.3±4.5
FH inside-out3%+1.4+0.2+2.4+4.0±3.9

Lean FH inside-out: +5.4±4.2 per 100 returns v the current mix (850 returns charted)

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 clay. Each player's clay record is shrunk toward their all-surface one, so a thin sample on it moves the numbers only a little.

Na Li

Favour

ShotEdgeOwnTheirs
FH to their forehand · serve +1+3.7±4.5+2.6+1.1
FH to their backhand · rally+3.5±3.8+2.5+1.0
BH to their backhand · serve +1+2.7±4.0+1.9+0.7
FH to the middle · rally+2.4±2.7+1.6+0.8
BH to their forehand · serve +1+1.4±5.7−0.7+2.1
FH to the middle · return +1+0.6±3.4−1.8+2.3

Avoid

ShotEdgeOwnTheirs
BH to their forehand · return +1−9.4±6.0−1.9−7.4
FH to their forehand · return−7.3±5.0−4.6−2.7
FH to their backhand · return +1−7.3±5.1−5.3−2.0
BH to their backhand · return−3.9±3.7−3.9±0.0
BH to their forehand · rally−3.9±5.1−0.5−3.3

Maria Sharapova

Favour

ShotEdgeOwnTheirs
FH to their backhand · serve +1+7.5±4.8+2.1+5.4
FH to their forehand · return+4.5±4.9+0.6+3.8
FH to their backhand · return+4.2±5.0+0.6+3.6
BH to the middle · return+3.5±2.7+0.5+3.1
FH to their backhand · return +1+3.5±5.1+0.9+2.6
FH to the middle · return+2.1±3.0+1.4+0.7

Avoid

ShotEdgeOwnTheirs
FH to their forehand · return +1−6.5±4.4−2.4−4.1
BH to their forehand · rally−4.0±5.1−2.0−2.0
FH to their forehand · rally−3.7±3.4−1.1−2.6
BH to their backhand · return +1−3.3±4.2−3.6+0.3
FH to the middle · return +1−2.8±3.4−1.3−1.5

Against Maria Sharapova-like opponents

Na Li vMatchesServe pts wonReturn pts won
All charted opponents–58.9%44.0%
Maria Sharapova (charted head-to-head)2 57.8%44.7%

Similar by tactical fingerprint: Naomi Osaka, Anastasia Potapova, Karolina Pliskova, Iga Swiatek, Belinda Bencic, Ekaterina Alexandrova, Rebecca Sramkova, Shuai Zhang, Eugenie Bouchard. When two players have rarely met, their records against these lookalikes fill the gap.

Charted head-to-head