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Mark J Williams vs Ronnie O'Sullivan

See also CueTracker

1999/2000
Scottish Open (28 Mar - 9 Apr 2000)
Final Wales Mark J Williams (a) 1-9 England Ronnie O'Sullivan (a) Head to head

Session 1:
68-75 (RO 59, MW 68), 5-85 (65), 0-69, 13-75, 53-65, 69-24 (60), 48-76 (67), 32-79 (69)

Session 2:
0-71 (57), 1-94 (58)

Referee: Peter Reinaldi

2000/2001
China Open (9-17 Dec 2000)
Final Wales Mark J Williams (a) 3-9 England Ronnie O'Sullivan (a) Head to head

Session 1:
11-77 (70), 71-7 (63), 60-68 (54 RO), 9-103 (76), 53-68, 0-87 (87), 6-92 (63), 18-74 (74)

Session 2:
63-59, 70-35 (65), 43-75 (68), 6-99 (54)

Referee: Eirian Williams

2005/2006
World Championship (15 Apr - 1 May 2006)
QF Wales Mark J Williams 11-13 England Ronnie O'Sullivan Head to head
2007/2008
World Championship (19 Apr - 5 May 2008)
Rd 2 Wales Mark J Williams 7-13 England Ronnie O'Sullivan Head to head

70-75 (61), 71-32 (65), 48-72, 86-0 (55), 0-140 (140), 44-81 (81), 60-65 (59), 88-0 (88), 65-7 (64), 59-61, 81-0 (76), 10-102 (102), 32-65, 5-82 (78), 81-0 (81), 79-17 (73), 0-71 (71), 15-62 (60), 29-107 (100), 0-147 (147)

147 by O'Sullivan

2008/2009
Shanghai Masters (29 Jul - 4 Oct 2008)
QF Wales Mark J Williams 3-5 England Ronnie O'Sullivan Head to head
2009/2010
Masters (10-17 Jan 2010)
SF Wales Mark J Williams 5-6 England Ronnie O'Sullivan Head to head
World Championship (17 Apr - 3 May 2010)
Rd 2 Wales Mark J Williams 10-13 England Ronnie O'Sullivan Head to head
2010/2011
Premier League Group Stage (2 Sep - 19 Nov 2010)
Grp Wales Mark J Williams 2-4 England Ronnie O'Sullivan Head to head

99�0 (98), 123�0 (78), 16�61, 74�38 (70), 103�15 (50), 4�78

Championship League - Group 2 (5-6 Jan 2011)
Grp Wales Mark J Williams 3-0 England Ronnie O'Sullivan Head to head
Final Wales Mark J Williams 3-2 England Ronnie O'Sullivan Head to head

2-115 (115), 68-9, 0-132 (132), 138-0 (138), 60-38

2011/2012
PTC 5 (21-25 Sep 2011)
Rd 1 Wales Mark J Williams 1-4 England Ronnie O'Sullivan [1] Head to head Details 
Premier League Finals (26-27 Nov 2011)
SF Wales Mark J Williams 2-5 England Ronnie O'Sullivan Head to head Details 

66-0, 33-70, 3-109 (109), 59-34, 0-96 (55), 0-85 (84), 9-92 (88)

Welsh Open (13-19 Feb 2012)
Rd 2 Wales Mark J Williams [3] 1-4 England Ronnie O'Sullivan [16] Head to head Details 
China Open (26 Mar - 1 Apr 2012)
Rd 2 Wales Mark J Williams [4] 1-5 England Ronnie O'Sullivan [16] Head to head Details 
World Championship (21 Apr - 7 May 2012)
Rd 2 Wales Mark J Williams [3] 6-13 England Ronnie O'Sullivan [14] Head to head Details 
2013/2014
Euro Tour 1 (6-9 Jun 2013)
QF Wales Mark J Williams [9] 0-4 England Ronnie O'Sullivan [11] Head to head Details 
2014/2015
International Championship (26 Oct - 2 Nov 2014)
QF Wales Mark J Williams [21] 6-5 England Ronnie O'Sullivan [4] Head to head Details 
2015/2016
Championship League - Group 1 (4-5 Jan 2016)
Grp Wales Mark J Williams 2-3 England Ronnie O'Sullivan Head to head Details 
Masters (10-17 Jan 2016)
Rd 1 Wales Mark J Williams [13] 5-6 England Ronnie O'Sullivan [6] Head to head Details 

1-80, 47-55, 71-35 (64), 67-27
71-47, 68-5, 0-104 (104), 12-83 (60)
0-130 (117), 85-50 (MJW 50, ROS 50), 28-63 (62)

This was O'Sullivan 800th match win

Championship League - Winners' Group (2-3 Mar 2016)
Grp Wales Mark J Williams 3-0 England Ronnie O'Sullivan Head to head Details 

First loss for O'Sullivan in 2016 after 24 straight wins

2016/2017
UK Championship (22 Nov - 4 Dec 2016)
QF Wales Mark J Williams [16] 2-6 England Ronnie O'Sullivan [8] Head to head Details 
2017/2018
Shanghai Masters (13-18 Nov 2017)
QF Wales Mark J Williams [16] 1-5 England Ronnie O'Sullivan [13] Head to head Details 
2019/2020
World Championship (31 Jul - 16 Aug 2020)
QF Wales Mark J Williams [3] 10-13 England Ronnie O'Sullivan [6] Head to head Details 
O'Sullivan was 7-2 and 8-4 down. Re-spotted black in frame 23.
2020/2021
Championship League - Group 5 (10-11 Feb 2021)
Grp Wales Mark J Williams 3-1 England Ronnie O'Sullivan Head to head Details 
Welsh Open (15-21 Feb 2021)
SF Wales Mark J Williams [14] 1-6 England Ronnie O'Sullivan [2] Head to head Details 

79-36 (73), 1-115 (102), 0-77 (77), 27-75 (54)
27-61, 40-65, 30-70 (69)

2021/2022
Tour Championship (28 Mar - 3 Apr 2022)
QF Wales Mark J Williams [6] 9-10 England Ronnie O'Sullivan [3] Head to head Details 
Re-rack in frame 12
2022/2023
Masters (8-15 Jan 2023)
QF Wales Mark J Williams [7] 6-5 England Ronnie O'Sullivan [2] Head to head Details 

143 by Williams in frame 7 is the highest break of the tournament so far. Re-rack in frame 9.

2023/2024
Tour Championship (1-7 Apr 2024)
Final Wales Mark J Williams [8] 10-5 England Ronnie O'Sullivan [2] Head to head Details 

Session 1:

73-29 (66), 10-107, 91-6 (91), 137-0 (66,67), 0-102 (102)
0-127 (127), 1-78 (59), 1-121 (121)

Session 2:62-33, 117-0 (104), 66-42 (54), 105-8 (99)
112-27 (112), 78-0 (78), 50-19

Referee: Olivier Marteel

This was Williams' 26th ranking title and second of the season.