RallyIQ

WTA · Right-handed · 85 charted matches · 1985–1999

Steffi Graf

Archetype: Chip returner · Slice-heavy

Against an average opponent

Serve points won 61.7% ±2.4 raw 60.7% · tour 56.3% · 6,338 points
Return points won 46.4% ±2.6 raw 46.0% · tour 43.7% · 6,272 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.

Value per 100 shots

Direction choice +0.53 ±0.08 better than 100% of WTA · raw +0.54
Shot selection −0.44 ±0.09 better than 13% of WTA · raw −0.42
Execution −0.43 ±0.23 better than 36% of WTA · raw −0.24
Tactical adaptability −0.03 first serves toward what's working, set to set · 85 matches
Adaptation speed +0.03 same, every two to three service games · per 100 first serves
Points left on the table 2.61 per 100 shots vs best direction · lower than 52% of WTA

Points gained per 100 shots compared with an average tour player in the same position, adjusted for the strength of the opponents faced, with a 90% margin (shots clustered by match). Raw is before the opponent adjustment. Built on 35,955 shots.

Shot expected value

The share of points Steffi Graf 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 · 2,776 shots

OptionUsedWin %Tour
BH slice crosscourt 47% 50.3%±2.3 40.4%
BH slice through the middle 16% 42.4%±3.7 34.4%
BH slice down the line 13% 46.7%±4.2 31.7%
FH inside-out 9% 52.6%±5.0 52.5%
FH inside-in 5% 54.8%±6.5 55.6%
BH crosscourt 3% 51.7%±8.6 47.6%
FH through the middle 2% 51.8%±9.0 45.1%
BH drop shot crosscourt 1% 49.1%±11.2 47.5%

Long rally, 9+: drive to your backhand side

position worth 44% to the average player · 1,973 shots

OptionUsedWin %Tour
BH slice crosscourt 47% 49.4%±2.7 38.7%
BH slice down the line 17% 48.2%±4.4 34.0%
BH slice through the middle 15% 41.0%±4.6 33.4%
FH inside-out 8% 57.5%±6.2 54.1%
FH inside-in 4% 54.1%±7.9 54.7%
BH crosscourt 3% 54.2%±9.6 47.9%
BH drop shot crosscourt 3% 53.2%±9.7 48.7%
BH through the middle 1% 35.2%±11.5 42.7%

Rally, shots 5–8: drive to your middle

position worth 50% to the average player · 1,367 shots

OptionUsedWin %Tour
FH crosscourt 29% 59.1%±4.0 52.7%
FH down the line 22% 56.5%±4.6 52.2%
BH slice crosscourt 17% 52.0%±5.2 49.5%
FH through the middle 11% 46.5%±6.4 45.8%
BH slice through the middle 10% 45.2%±6.5 44.8%
BH slice down the line 5% 49.7%±8.9 43.9%
FH down the line + approach 3% 66.2%±9.8 68.6%
FH crosscourt + approach 2% 71.3%±11.5 69.7%

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

position worth 43% to the average player · 1,304 shots

OptionUsedWin %Tour
FH crosscourt 52% 52.8%±3.1 46.7%
FH down the line 24% 49.3%±4.5 44.9%
FH through the middle 18% 43.6%±5.1 41.3%
FH slice through the middle 2% 30.8%±11.3 29.2%
FH down the line + approach 2% 70.2%±11.9 65.4%
FH slice crosscourt 1% 33.5%±13.9 31.9%

Serve under pressure

Pressure predictability index +1 How much less varied Steffi Graf's first-serve direction gets on break points. Positive means easier to read. Based on 613 break-point first serves.

Deuce court

1st serveUsageBreak ptWon when in
Wide 51% 39% ▼ 68% / 66%
Body 14% 23% ▲ 57% / 57%
T 36% 38% 67% / 68%

3,083 normal · 133 break-point 1st serves

Ad court

1st serveUsageBreak ptWon when in
Wide 57% 59% 64% / 66%
Body 14% 11% 58% / 56%
T 30% 30% 67% / 64%

2,495 normal · 480 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
Wide50% 62.3%±2.0 n=1,617 65% ▲
Body14% 56.6%±3.7 n=452 0% ▼
T36% 60.7%±2.3 n=1,147 35%

Consistent with an optimal mix (p = 0.06).
Optimal mix: +0.9 per 100 first serves.

Ad court

1st serveUsagePoints wonOptimal
Wide57% 60.5%±1.9 n=1,696 60% ▲
Body13% 56.5%±4.0 n=394 0% ▼
T30% 60.0%±2.7 n=885 40% ▲

Consistent with an optimal mix (p = 0.27).
Optimal mix: +0.6 per 100 first serves.

Exploitability 0.75 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: −0.7±1.8 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. (2,586 repeats, 3,435 switches.)

Return by serve direction

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

ServeCourtDirectionPointsWonvs tour
1stAd courtBody 298 48% +4.0±4.5
1stAd courtT 419 38% +2.3±3.8
1stAd courtWide 1,230 42% +8.0±2.3
1stDeuce courtBody 506 45% +2.5±3.5
1stDeuce courtT 946 43% +11.3±2.6
1stDeuce courtWide 654 37% +3.4±3.0
2ndAd courtBody 224 54% −0.9±5.1
2ndAd courtT 150 50% −5.3±6.1
2ndAd courtWide 623 54% +0.4±3.2
2ndDeuce courtBody 352 54% −0.7±4.2
2ndDeuce courtT 420 52% −3.6±3.9
2ndDeuce courtWide 284 55% +1.4±4.6

Signature patterns

Recurring sequences that win more than Steffi Graf's own baseline, ranked by edge weighted by how often they're used.

Serve → +1

  1. T serve (ad court) → FH down the line used 2.1% · won 64% · +1.0±6.4 vs own baseline
  2. T serve (deuce court) → FH down the line used 2.2% · won 62% · −0.5±6.3 vs own baseline
  3. Wide serve (deuce court) → FH crosscourt used 4.5% · won 59% · −3.6±4.7 vs own baseline
  4. Wide serve (ad court) → FH inside-out used 2.4% · won 57% · −5.7±6.3 vs own baseline
  5. T serve (ad court) → FH crosscourt used 3.0% · won 57% · −5.7±5.7 vs own baseline

Return

  1. vs wide serve (deuce court) → FH crosscourt, mid used 4.6% · won 62% · +15.8±4.7 vs own baseline
  2. vs wide serve (ad court) → FH inside-out, mid used 2.8% · won 65% · +19.2±5.9 vs own baseline
  3. vs body serve (deuce court) → FH crosscourt, mid used 2.9% · won 62% · +16.5±5.8 vs own baseline
  4. vs wide serve (ad court) → BH slice crosscourt, mid used 9.5% · won 53% · +6.8±3.4 vs own baseline
  5. vs wide serve (ad court) → BH slice through the middle, mid used 3.1% · won 55% · +9.5±5.8 vs own baseline

Rally, consecutive own shots

  1. BH slice crosscourt → FH inside-in used 1.4% · won 63% · +12.4±6.3 vs own baseline
  2. FH down the line → FH crosscourt used 1.3% · won 62% · +11.7±6.6 vs own baseline
  3. FH crosscourt → FH down the line used 3.5% · won 57% · +6.3±4.4 vs own baseline
  4. FH through the middle → FH crosscourt used 1.6% · won 58% · +7.9±6.2 vs own baseline
  5. FH crosscourt → FH crosscourt used 3.7% · won 55% · +4.2±4.3 vs own baseline

Discovered sequences

Mined from every me → opponent → me run of three shots, with no templates. Ranked by how much more often Steffi Graf wins the point once the sequence happens, weighted by how often it happens. Think of them as chess openings.

  1. FH down the line → BH through the middle → FH crosscourt used 0.4% · won 65% · +13.2±8.2 vs own baseline · +13.1 vs tour on the same sequence Disrupted by Serena Williams (6/10), Jennifer Capriati (4/6)
  2. BH slice crosscourt → BH crosscourt → FH inside-in used 0.5% · won 62% · +10.0±8.0 vs own baseline · +7.3 vs tour on the same sequence Disrupted by Gabriela Sabatini (1/6), Martina Hingis (3/6)
  3. T serve → FH through the middle return, mid → FH down the line used 0.3% · won 63% · +10.8±9.5 vs own baseline · +17.0 vs tour on the same sequence Disrupted by Monica Seles (6/8), Arantxa Sanchez Vicario (5/6)
  4. FH crosscourt → FH through the middle → FH down the line + approach used 0.1% · won 67% · +14.6±11.2 vs own baseline · +11.1 vs tour on the same sequence Disrupted by Arantxa Sanchez Vicario (7/9)
  5. FH crosscourt → FH through the middle → FH down the line used 0.8% · won 58% · +5.9±6.5 vs own baseline · +5.5 vs tour on the same sequence Disrupted by Amanda Coetzer (2/7), Mary Joe Fernandez (2/7)
  6. FH crosscourt → FH through the middle → FH crosscourt used 0.7% · won 59% · +6.6±7.1 vs own baseline · +4.9 vs tour on the same sequence

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

BH slice to their forehand · return +1+9.0353
BH slice to their forehand · rally+7.41,682
BH slice to their forehand · return+7.3515
BH slice to their forehand · serve +1+7.1340
BH slice to their backhand · return+6.61,178

Most exposed to

BH slice to their backhand · serve +1−6.2329
BH slice to their backhand · return−4.8554
BH slice to their forehand · return−4.6129
BH slice to their forehand · return +1−4.6139
FH slice to the middle · return−4.4220

Tactical fingerprint

Each bar shows how far a style trait is from the WTA average, in standard deviations.

Backhand slice88%
Run-around forehands34%
Chipped returns52%
Wide serves · ad57%
Wide serves · deuce50%
Avg rally length4.8
1st serve in67%
Points at net11%
BH down the line24%
Serve & volley1%
T serves · deuce36%
Point-ending shots22.5%
Drop shots / shot1.2%
Unforced errors / shot9.3%
FH down the line26%
Forehand share51%
T serves · ad30%
Through the middle16%
Deep returns15%

Plays most like

  1. Conchita Martinez 1993–2003 plan v
  2. Kirsten Flipkens 2013–2022 plan v
  3. Roberta Vinci 2012–2017 plan v
  4. Ashleigh Barty 2013–2022 plan v
  5. Francesca Schiavone 2006–2017 plan v
  6. Daria Saville 2015–2024 plan v
  7. Diane Parry 2021–2026 plan v
  8. Svetlana Kuznetsova 2004–2021 plan v

Closest from another era

  1. Kirsten Flipkens 2013–2022
  2. Roberta Vinci 2012–2017
  3. Ashleigh Barty 2013–2022

Charted matches