RallyIQ

WTA · Right-handed · 6 charted matches · 2025–2026

Lois Boisson

Against an average opponent

Serve points won 60.4% ±3.6 raw 59.8% · tour 56.3% · 396 points
Return points won 45.5% ±3.8 raw 42.5% · tour 43.7% · 414 points

Serve and return points won, refitted against every opponent at once so a record built on weak or strong opposition is put on the same scale. Career, all surfaces, with a 90% margin. Raw is the plain share of points won.

Shot expected value

The share of points Lois Boisson goes on to win after each option in the positions they face most often, shrunk toward tour average when the sample is small. Showing the 8 most-used options; teal marks the best one with at least 30 shots.

Rally, shots 5–8: drive to your backhand side

position worth 45% to the average player · 141 shots

OptionUsedWin %Tour
BH slice through the middle 25% 38.0%±10.8 34.4%
BH slice crosscourt 16% 39.7%±12.3 40.4%
BH through the middle 14% 54.2%±13.0 43.3%
FH inside-in 12% 59.8%±13.3 55.6%
BH down the line 11% 31.5%±12.7 46.8%
BH slice down the line 8% 39.8%±14.5 31.7%
BH crosscourt 8% 40.4%±14.5 47.6%

Rally, shots 5–8: drive to your forehand side

position worth 43% to the average player · 93 shots

OptionUsedWin %Tour
FH crosscourt 37% 41.4%±11.0 46.7%
FH through the middle 27% 40.6%±12.0 41.3%
FH down the line 23% 46.3%±12.8 44.9%
FH slice through the middle 14% 29.8%±13.1 29.2%

Return +1: drive to your backhand side

position worth 44% to the average player · 84 shots

OptionUsedWin %Tour
BH slice through the middle 32% 43.9%±11.9 33.2%
BH through the middle 17% 43.0%±14.0 43.0%
FH inside-out 14% 56.5%±14.4 55.4%
BH slice crosscourt 13% 35.2%±14.1 39.6%

Rally, shots 5–8: drive to your middle

position worth 50% to the average player · 60 shots

OptionUsedWin %Tour
FH down the line 37% 58.2%±12.5 52.2%
FH crosscourt 28% 58.2%±13.3 52.7%
FH through the middle 23% 47.5%±14.1 45.8%

Serve under pressure

Pressure predictability index +1 How much less varied Lois Boisson's first-serve direction gets on break points. Positive means easier to read. Based on 45 break-point first serves.

Deuce court

1st serveUsageBreak ptWon when in
Wide 37% 30% 70% / 66%
Body 16% 10% 65% / 57%
T 46% 60% ▲ 68% / 68%

198 normal · 10 break-point 1st serves

Ad court

1st serveUsageBreak ptWon when in
Wide 47% 57% ▲ 75% / 66%
Body 9% 14% 60% / 56%
T 44% 29% ▼ 66% / 64%

153 normal · 35 break-point 1st serves

Is the serve mix in equilibrium?

Game theory says a well-mixed server wins equally often with every direction they use. If one direction wins more, it's underused and points are being left behind. This is the minimax test Walker and Wooders ran on Wimbledon finals, applied to every charted first serve. Win rates include faults. "Optimal" allows for returners reading a habit. A direction loses 0.19 points per 100 serves for every 10 points of habitual usage, measured from WTA servers whose mix drifted between matches. Shifts stay within the range servers' habits actually vary, the only range that response was measured over.

Deuce court

1st serveUsagePoints wonOptimal
Wide37% 60.6%±7.8 n=77 52% ▲
Body16% 59.4%±10.2 n=33 1% ▼
T47% 54.4%±7.2 n=98 47%

Consistent with an optimal mix (p = 0.48).
Optimal mix: +0.5 per 100 first serves.

Ad court

1st serveUsagePoints won
Wide49% 63.9%±7.2 n=92
Body10% 61.4%±11.4 n=19
T41% 60.7%±7.8 n=77

Consistent with an optimal mix (p = 0.82).

Exploitability 0.54 points per 100 first serves What the optimal mix would win over the current one, both courts. More exploitable than 100% of WTA servers. Tested on matches they weren't fitted on, WTA mixes picked this way win 0.42 per 100 first serves on average.

Repeating the previous direction to the same court: −6.7±8.0 points per 100 against switching. Negative means returners read repeats. Tour-wide, repeating costs women about 0.4 points per 100 and costs men nothing, so men's returners don't measurably anticipate direction. (125 repeats, 259 switches.)

Return by serve direction

Return points won against each serve direction, compared with the tour average.

ServeCourtDirectionPointsWonvs tour
1stAd courtBody 22 46% +2.6±11.4
1stAd courtT 44 33% −2.2±9.0
1stAd courtWide 51 30% −4.4±8.4
1stDeuce courtBody 26 37% −5.5±10.6
1stDeuce courtT 41 25% −7.3±8.4
1stDeuce courtWide 54 36% +1.9±8.6
2ndAd courtBody 40 55% ±0.0±9.8
2ndAd courtT 8 54% −1.1±13.3
2ndAd courtWide 35 52% −1.1±10.2
2ndDeuce courtBody 38 53% −1.0±10.0
2ndDeuce courtT 49 64% +8.3±8.9
2ndDeuce courtWide 6 53% −0.6±13.7

Strengths and vulnerabilities

Value per 100 shots compared with the average player hitting (strengths) or facing (vulnerabilities) the same shot. Only shot types seen at least 120 times.

Hurts opponents most with

Most exposed to

FH to their forehand · rally+3.0125

Active players who are best at the shot in the top weakness: Linda Fruhvirtova, Maja Chwalinska, Sara Sorribes Tormo, Linda Klimovicova, Nadia Podoroska

Charted matches