Second-favourite Judd Trump trails Ding Junhui 6-2 after the first session of their second-round match at the World Championship in Sheffield.
Trump made a century as the pair shared the first four frames, but Ding made a ton of his own as he won four in a row.
During the mid-session interval, Trump called Dominic Dale “clueless” on Twitter after the Welsh player questioned his cueball control.
Kyren Wilson opened up a 7-1 lead over Mark Allen in an incredible session.
Both first-to-13 matches resume at 19:00 BST, with the final sessions on Monday from 13:00 BST.
Shanghai Masters champion Wilson took the opening frame on the black and the Englishman made further breaks of 50, 93 and 103 to give him a 7-0 advantage, but Northern Irishman Allen snatched the eighth to avoid a whitewash.
Tournament favourite Ronnie O’Sullivan trails Barry Hawkins 5-3, while John Higgins is in front against Ricky Walden by the same scoreline. Both matches resume at 14:30 BST.
Tweeter Trump in trouble
The Trump-Ding tie was the pick of the second-round matches and it lived up to its billing.
Having gone a second season without winning a trophy, China’s Ding had to come through qualifying to make it to the main stages of the competition and took control.
Englishman and world number five Trump made 85 and 106 with Ding compiling 71 in the first four frames.
At the mid-session interval, Trump responded to a Tweet by Dale, who is not playing the tournament, with “watch my first break of 80 something then watch both his frames”.
From there on, Ding, an 11-time ranking title winner, took control, winning the next four including a 112 and 79.