Game plan

Andy Murray v Michael Chang

Every number combines what Andy Murray does well with what Michael Chang allows, each measured against the tour average and shrunk toward it when the sample is thin. Flip perspective

Forecast

Andy Murray wins, best of 3 81%90%: 63%–92% · best of 5: 86%

Serve points won 63.8% / 57.0% Andy / Michael · tour 61.3%

Strengths only, no similarity priors 83%serve 64.0% / 56.6%

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 At least one of them is no longer active or has too little charted in the last three seasons, so both are compared on their careers.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 Andy Murray's record against Michael Chang's tactical lookalikes and in their charted head-to-heads (lookalikes: −0.4 on serve, −0.8 on return vs expectation (2370 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	Andy	Michael
Direction choice	+0.14 ±0.03 better than 87%	−0.01 ±0.13 better than 54%
Shot selection	−0.45 ±0.05 better than 13%	−0.02 ±0.19 better than 49%
Execution	+0.94 ±0.16 better than 95%	+1.06 ±0.36 better than 96%
Points left on the table	2.23 ±0.05 lower than 90%	2.88 ±0.27 lower than 26%

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.

Andy Murray serving

Deuce court

1st serve	Now	Andy wins	v Michael	Matchup	Optimal
Wide	47%	71%	75%	73.0%±3.4	41% ▼
Body	8%	67%	59%	63.1%±6.6	0% ▼
T	46%	80%	79%	83.1%±3.0	59% ▲

Optimal v Michael Chang: +0.7±0.5 per 100 first serves (faults included) over the current mix. Serving T every time would read +6.2 per 100 first serves in before the returner adjusts.

Ad court

1st serve	Now	Andy wins	v Michael	Matchup	Optimal
Wide	47%	77%	67%	71.7%±3.5	34% ▼
Body	8%	61%	62%	60.8%±7.4	8%
T	45%	70%	74%	71.9%±4.0	58% ▲

Optimal v Michael Chang: +0.5±0.5 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving T every time would read +1.0 per 100 first serves in before the returner adjusts.

Michael Chang serving

Deuce court

1st serve	Now	Michael wins	v Andy	Matchup	Optimal
Wide	41%	65%	70%	61.3%±3.8	37% ▼
Body	8%	56%	59%	51.7%±7.6	0% ▼
T	50%	69%	76%	69.6%±3.6	63% ▲

Optimal v Andy Murray: +0.5±0.5 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving T every time would read +4.9 per 100 first serves in before the returner adjusts.

Ad court

1st serve	Now	Michael wins	v Andy	Matchup	Optimal
Wide	48%	65%	71%	63.3%±3.7	61% ▲
Body	7%	59%	57%	52.9%±8.2	0% ▼
T	44%	63%	68%	58.9%±4.2	39% ▼

Optimal v Andy Murray: +0.4±0.5 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.

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.

Andy Murray returning

1st serve to the forehand

Return	Now	Tour	Own	v Michael	Value
FH through the middle	42%	+4.3	+1.4	+1.2	+6.8±1.5
FH down the line	17%	+1.7	+6.2	+2.7	+10.6±2.8
FH crosscourt	16%	+5.5	+1.9	+4.4	+11.8±2.8
FH slice through the middle	14%	−4.2	+2.7	+2.7	+1.2±1.8
FH slice down the line	5%	−4.3	+3.1	+0.9	−0.3±2.4

Lean FH crosscourt: +4.9±2.5 per 100 returns v the current mix (5314 returns charted)

1st serve to the backhand

Return	Now	Tour	Own	v Michael	Value
BH crosscourt	27%	+8.8	+4.6	+2.4	+15.7±2.3
BH through the middle	25%	+6.4	+2.2	−0.1	+8.5±1.8
BH slice through the middle	25%	−4.2	+2.7	+5.0	+3.4±1.5
BH slice crosscourt	15%	+0.5	+2.4	+5.7	+8.6±1.9
BH slice down the line	4%	−8.4	+0.9	+1.8	−5.7±3.2

Lean BH crosscourt: +7.1±1.8 per 100 returns v the current mix (4642 returns charted)

2nd serve to the forehand

Return	Now	Tour	Own	v Michael	Value
FH through the middle	43%	−3.5	+1.6	+2.5	+0.6±1.9
FH down the line	28%	−1.8	+2.5	+2.4	+3.1±3.2
FH crosscourt	23%	−0.2	+1.9	+1.6	+3.3±3.2
BH through the middle	3%	+0.1	−1.3	+2.2	+1.0±2.0
BH inside-in	1%	+2.5	+2.7	+0.4	+5.6±3.1

Lean BH inside-in: +3.7±3.4 per 100 returns v the current mix (1297 returns charted)

2nd serve to the backhand

Return	Now	Tour	Own	v Michael	Value
BH crosscourt	57%	+1.0	+1.7	+0.4	+3.1±2.1
BH through the middle	29%	−2.9	+0.1	+2.2	−0.6±1.9
BH down the line	7%	−0.2	+2.4	+0.4	+2.6±4.6
BH slice crosscourt	3%	−4.0	−1.9	+3.0	−2.9±2.4
BH slice through the middle	2%	−11.3	−1.4	+3.4	−9.3±2.4

Lean BH crosscourt: +1.6±1.1 per 100 returns v the current mix (2339 returns charted)

Michael Chang returning

1st serve to the forehand

Return	Now	Tour	Own	v Andy	Value
FH through the middle	53%	+4.3	+1.7	+1.2	+7.2±1.6
FH down the line	29%	+1.7	+2.6	+0.2	+4.6±2.9
FH crosscourt	17%	+5.5	−2.6	+1.3	+4.2±3.2
BH through the middle	1%	+6.6	+0.4	−0.1	+6.9±1.5

Lean FH through the middle: +1.3±1.2 per 100 returns v the current mix (676 returns charted)

1st serve to the backhand

Return	Now	Tour	Own	v Andy	Value
BH through the middle	44%	+6.4	−2.4	−0.1	+3.9±1.6
BH crosscourt	32%	+8.8	+5.1	+0.9	+14.8±2.3
BH down the line	12%	+4.2	+4.0	+0.1	+8.4±3.7
BH slice through the middle	6%	−4.2	−0.9	−0.4	−5.5±1.9
BH slice crosscourt	4%	+0.5	+2.1	+0.5	+3.1±2.4

Lean BH crosscourt: +7.8±1.8 per 100 returns v the current mix (718 returns charted)

2nd serve to the forehand

Return	Now	Tour	Own	v Andy	Value
FH through the middle	47%	−3.5	+1.7	+0.7	−1.1±2.0
FH down the line	26%	−1.8	+0.9	+2.6	+1.6±3.7
FH crosscourt	26%	−0.2	+1.4	+1.5	+2.7±3.4
BH inside-in	2%	+2.5	−0.4	+1.8	+4.0±1.7

Lean FH crosscourt: +2.0±2.9 per 100 returns v the current mix (286 returns charted, inside the 90% margin)

2nd serve to the backhand

Return	Now	Tour	Own	v Andy	Value
BH crosscourt	50%	+1.0	+1.5	+1.8	+4.4±1.9
BH through the middle	35%	−2.9	+1.0	+1.1	−0.8±1.6
BH down the line	12%	−0.2	+3.9	+1.3	+5.0±3.9
FH through the middle	2%	−2.9	−1.0	+0.7	−3.2±1.4
FH inside-out	1%	+1.0	+0.4	+2.6	+3.9±2.2

Lean BH down the line: +2.5±3.6 per 100 returns v the current mix (486 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 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.

Andy Murray

Favour

Shot	Edge	Own	Theirs
FH to their backhand · return	+8.7±3.3	+4.0	+4.7
BH volley to their backhand · rally	+7.7±7.3	+0.4	+7.3
BH slice to the middle · return	+7.4±2.6	+2.1	+5.3
FH to their forehand · return	+6.3±4.2	+3.8	+2.5
BH slice to the middle · return +1	+6.1±3.0	+1.9	+4.2
BH slice to their backhand · return	+6.0±3.0	+0.7	+5.3

Avoid

Shot	Edge	Own	Theirs
FH volley to their backhand · rally	−4.5±7.3	−0.9	−3.6
BH to their forehand · return +1	−3.1±5.5	−0.7	−2.5
BH slice to their forehand · rally	−1.1±4.4	−3.7	+2.6
FH volley to the middle · rally	−0.7±8.2	+3.5	−4.2
FH to the middle · serve +1	−0.3±3.1	−2.5	+2.2

Michael Chang

Favour

Shot	Edge	Own	Theirs
FH to their backhand · return	+9.7±3.7	+8.0	+1.7
BH volley to their backhand · rally	+9.1±7.6	+5.2	+3.9
FH to their backhand · rally	+5.1±2.0	+4.1	+1.0
FH volley to their forehand · rally	+5.0±7.6	+1.9	+3.1
FH volley to their backhand · rally	+4.0±7.6	+3.4	+0.6
BH lob to the middle · rally	+3.7±4.1	+1.9	+1.8

Avoid

Shot	Edge	Own	Theirs
BH volley to their forehand · rally	−5.0±7.6	−4.2	−0.8
Smash to their forehand · rally	−4.8±5.9	−4.4	−0.4
BH to the middle · return	−1.7±2.0	+0.4	−2.0
BH to their forehand · return +1	−1.7±5.3	−0.7	−1.0
BH to the middle · rally	−1.5±1.6	±0.0	−1.5

Against Michael Chang-like opponents

Andy Murray v	Matches	Serve pts won	Return pts won
All charted opponents	–	63.7%	38.1%
Players most similar to Michael Chang	14	64.5%	37.2%

Similar by tactical fingerprint: Marcos Baghdatis, Lleyton Hewitt, Andy Roddick, David Nalbandian, Marat Safin, Juan Carlos Ferrero, Arnaud Clement, Magnus Norman, Aaron Krickstein. When two players have rarely met, their records against these lookalikes fill the gap.