Game plan

Juncheng Shang v Tallon Griekspoor

Every number combines what Juncheng Shang does well with what Tallon Griekspoor allows, each measured against the tour average and shrunk toward it when the sample is thin. Flip perspective

Forecast

Juncheng Shang wins, best of 3 59%90%: 31%–82% · best of 5: 61%

Serve points won 67.9% / 66.1% Juncheng / Tallon · tour 63.5%

Strengths only, no similarity priors 58%serve 67.6% / 66.0%

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 Juncheng Shang's record against Tallon Griekspoor's tactical lookalikes and in their charted head-to-heads (lookalikes: +5.9 on serve, −0.8 on return vs expectation (131 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	Juncheng	Tallon
Direction choice	−0.21 ±0.13 better than 13%	+0.19 ±0.03 better than 93%
Shot selection	+0.51 ±0.30 better than 94%	+0.07 ±0.08 better than 61%
Execution	−0.47 ±0.59 better than 46%	−1.38 ±0.28 better than 13%
Points left on the table	3.00 ±0.24 lower than 19%	2.42 ±0.06 lower than 71%

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.

Juncheng Shang serving

Deuce court

1st serve	Now	Juncheng wins	v Tallon	Matchup	Optimal
Wide	35%	74%	76%	76.6%±6.7	48% ▲
Body	13%	60%	64%	61.0%±9.6	0% ▼
T	52%	67%	79%	71.6%±5.7	52%

Optimal v Tallon Griekspoor: +0.8±0.8 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving wide every time would read +4.7 per 100 first serves in before the returner adjusts.

Ad court

1st serve	Now	Juncheng wins	v Tallon	Matchup	Optimal
Wide	55%	65%	77%	69.2%±5.9	55%
Body	16%	68%	66%	71.5%±8.5	3% ▼
T	29%	72%	74%	74.6%±7.9	42% ▲

Optimal v Tallon Griekspoor: +0.4±0.9 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving T every time would read +3.5 per 100 first serves in before the returner adjusts.

Tallon Griekspoor serving

Deuce court

1st serve	Now	Tallon wins	v Juncheng	Matchup	Optimal
Wide	48%	74%	70%	71.2%±5.9	44% ▼
Body	8%	65%	65%	67.0%±10.8	0% ▼
T	43%	77%	78%	80.0%±5.2	56% ▲

Optimal v Juncheng Shang: +0.6±0.7 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving T every time would read +5.4 per 100 first serves in before the returner adjusts.

Ad court

1st serve	Now	Tallon wins	v Juncheng	Matchup	Optimal
Wide	54%	76%	69%	72.6%±6.3	63% ▲
Body	9%	60%	63%	59.4%±10.3	0% ▼
T	37%	73%	73%	74.5%±6.6	37%

Optimal v Juncheng Shang: +0.5±0.6 per 100 first serves (faults included) over the current mix, inside the 90% margin. Serving T every time would read +2.3 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.

Juncheng Shang returning

1st serve to the forehand

Return	Now	Tour	Own	v Tallon	Value
FH through the middle	53%	+4.3	+1.4	−0.6	+5.1±2.3
FH down the line	20%	+1.7	−0.5	−2.1	−0.9±3.7
FH crosscourt	16%	+5.5	+1.6	−3.3	+3.7±3.5
FH slice through the middle	7%	−4.2	−1.0	−2.5	−7.7±1.8
FH slice crosscourt	4%	−4.3	−0.5	−2.0	−6.9±2.3

Lean FH through the middle: +2.8±1.4 per 100 returns v the current mix (166 returns charted)

1st serve to the backhand

Return	Now	Tour	Own	v Tallon	Value
BH through the middle	46%	+6.4	+0.8	−1.7	+5.5±2.2
BH crosscourt	26%	+8.8	+0.5	−4.4	+4.9±3.3
BH down the line	14%	+4.2	−1.7	−3.1	−0.6±3.5
BH slice through the middle	10%	−4.2	−1.3	−3.9	−9.4±1.9
BH slice down the line	4%	−8.4	−0.2	−3.9	−12.5±2.5

Lean BH through the middle: +3.2±1.5 per 100 returns v the current mix (175 returns charted)

2nd serve to the forehand

Return	Now	Tour	Own	v Tallon	Value
FH through the middle	60%	−3.5	+1.2	+0.4	−1.9±2.3
FH crosscourt	32%	−0.2	−2.2	−1.8	−4.2±3.6
FH down the line	8%	−1.8	−1.2	−0.3	−3.2±3.1

Lean FH through the middle: +0.9±1.5 per 100 returns v the current mix (65 returns charted, inside the 90% margin)

2nd serve to the backhand

Return	Now	Tour	Own	v Tallon	Value
BH through the middle	52%	−2.9	−0.7	−0.9	−4.5±2.0
BH crosscourt	20%	+1.0	+2.3	−3.8	−0.5±3.0
BH down the line	18%	−0.2	+1.3	−2.8	−1.6±3.7
FH inside-in	5%	+0.6	−1.9	−1.8	−3.2±3.0
FH through the middle	5%	−2.9	+0.4	+0.4	−2.1±1.4

Lean BH crosscourt: +2.5±2.7 per 100 returns v the current mix (132 returns charted, inside the 90% margin)

Tallon Griekspoor returning

1st serve to the forehand

Return	Now	Tour	Own	v Juncheng	Value
FH through the middle	42%	+4.3	−2.3	+1.0	+2.9±2.4
FH crosscourt	26%	+5.5	−2.2	−0.2	+3.1±3.4
FH slice through the middle	14%	−4.2	−3.3	−1.2	−8.8±1.9
FH down the line	11%	+1.7	−3.9	+1.2	−1.1±4.0
FH slice down the line	5%	−4.3	−1.9	±0.0	−6.1±2.1

Lean FH crosscourt: +3.0±2.7 per 100 returns v the current mix (1906 returns charted)

1st serve to the backhand

Return	Now	Tour	Own	v Juncheng	Value
BH through the middle	32%	+6.4	−1.5	+3.5	+8.4±2.1
BH crosscourt	27%	+8.8	−5.7	+4.4	+7.5±2.9
BH slice through the middle	20%	−4.2	−3.1	+0.2	−7.1±2.1
BH slice crosscourt	8%	+0.5	−4.8	+1.5	−2.8±2.7
BH down the line	8%	+4.2	−2.1	−0.2	+1.9±4.3

Lean BH through the middle: +6.0±1.7 per 100 returns v the current mix (2010 returns charted)

2nd serve to the forehand

Return	Now	Tour	Own	v Juncheng	Value
FH crosscourt	40%	−0.2	−1.0	−2.2	−3.4±4.0
FH through the middle	39%	−3.5	−3.0	−0.3	−6.7±2.6
FH down the line	15%	−1.8	−4.1	−0.6	−6.5±4.6
FH slice through the middle	5%	−12.7	−2.6	±0.0	−15.2±1.6
FH slice down the line	1%	−9.4	−0.4	±0.0	−9.8±1.3

Lean FH crosscourt: +2.4±2.7 per 100 returns v the current mix (471 returns charted, inside the 90% margin)

2nd serve to the backhand

Return	Now	Tour	Own	v Juncheng	Value
BH through the middle	38%	−2.9	−2.1	+1.1	−3.9±2.1
BH crosscourt	31%	+1.0	−4.1	+0.4	−2.7±2.8
BH down the line	9%	−0.2	−2.9	+1.5	−1.6±4.8
FH through the middle	9%	−2.9	+0.6	−0.3	−2.6±2.3
FH inside-in	6%	+0.6	+2.0	−2.2	+0.4±4.3

Lean FH inside-in: +3.3±4.3 per 100 returns v the current mix (1307 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.

Juncheng Shang

Favour

Shot	Edge	Own	Theirs
BH to their forehand · rally	+6.6±3.0	+4.6	+2.0
BH to the middle · rally	+2.3±1.6	+1.9	+0.5
BH to the middle · return +1	+1.4±2.2	+1.3	+0.2
FH to the middle · return	+1.1±1.9	+1.6	−0.5
FH to the middle · rally	+0.4±1.7	±0.0	+0.4
FH to their backhand · rally	+0.1±1.9	+1.0	−0.8

Avoid

Shot	Edge	Own	Theirs
FH to their backhand · return	−5.5±3.3	−2.7	−2.9
BH to their forehand · return	−2.7±3.9	+1.6	−4.4
BH to their forehand · serve +1	−2.6±4.2	−2.7	+0.1
FH to their forehand · rally	−2.5±2.2	−1.9	−0.6
FH to their forehand · serve +1	−2.3±2.9	−1.8	−0.4

Tallon Griekspoor

Favour

Shot	Edge	Own	Theirs
FH to the middle · rally	+2.0±1.8	+0.2	+1.8
BH to the middle · return	+1.4±1.7	−2.3	+3.7
FH to their backhand · rally	+0.6±2.1	−0.5	+1.1
BH to the middle · rally	+0.4±1.7	−1.9	+2.2
FH to the middle · serve +1	−0.3±2.2	+0.1	−0.4
BH to their backhand · rally	−0.8±2.0	−1.3	+0.5

Avoid

Shot	Edge	Own	Theirs
BH to their backhand · return	−2.9±2.5	−4.2	+1.3
FH to the middle · return	−2.3±2.0	−2.2	±0.0
FH to their forehand · rally	−2.2±2.2	−1.8	−0.4
FH to their backhand · serve +1	−2.2±2.7	+0.4	−2.5
FH to their backhand · return +1	−2.1±3.3	+0.2	−2.3

Against Tallon Griekspoor-like opponents

Juncheng Shang v	Matches	Serve pts won	Return pts won
All charted opponents	–	61.3%	36.6%
Players most similar to Tallon Griekspoor	1	72.3%	33.3%

Similar by tactical fingerprint: Stefanos Tsitsipas, Arthur Fils, Ben Shelton, Tommy Paul, Felix Auger Aliassime, Alexei Popyrin, Zizou Bergs, Dominic Thiem, Lloyd Harris, Leonardo Mayer. When two players have rarely met, their records against these lookalikes fill the gap.