Venue: Venue Cymru, Llandudno Dates: 12-18 February
Coverage: Watch live on BBC TV, BBC iPlayer, BBC Red Button and online.
Five-time Welsh Open winner John Higgins is through to the last 32 after a 4-1 win against Tian Pengfei.
After winning the first frame, Higgins had a break of 54 on the way to taking a 2-0 lead, but Tian had his own half-century break to win the third frame.
But the 36-year-old from China only potted two reds in the following frame, as Higgins moved 3-1 ahead.
And the Scotsman sealed victory on the final black of the fifth frame to reach the third round in Llandudno.
Elsewhere in the evening session, Northern Ireland's Mark Allen comfortably beat Ma Hailong 4-0, and Jack Lisowski hit a break of 113 during his 4-2 win over Liam Pullen.
Wales' Duane Jones beat qualifier Liam Davies 4-1, while Martin O'Donnell provided a shock win by the same scoreline against Chris Wakelin.
Earlier on Tuesday defending champion Robert Milkins reached the third round with a 4-1 win over Allan Taylor.
Milkins, after a scratchy 4-3 first round win over Jamie Jones, started with a superb 140 break in frame one and rarely looked back.
"My potting was a bit better than yesterday, but I'm still making quite a few mistakes," said Milkins.
"I felt really good in Germany last week, probably the best I've felt this season.
"I've not really been good at all and it seems like it's coming together, but it seems for me to get that consistency is a lot more difficult than it used to be. Because I'm getting older it's hard."
Three-time world champion Mark Williams progressed into round three after a captivating but error-strewn match with Sanderson Lam.
England's Lam, ranked 65 in the world, will rue missed opportunities having forced a final-frame decider after coming from behind on three occasions.
Two-time Welsh Open champion Williams opened with a break of 90 to punish a costly miss on the black by Lam who responded with a break of 89 in the second frame.
Williams then fired in a 117 break in frame three, but Lam continued to battle as the contest ultimately went to a seventh frame which was won by the Welshman with an emphatic 96 break.
"I'm definitely pleased, I think I played quite well," said Williams.
"He [Lam] missed an easy black in the first frame and I think he missed another easy black, but he potted some unbelievable ones tight off the cushion.
"I think overall it was a good match, I think both of us played well in patches."
Adam Duffy clinched a convincing 4-0 win over Llanelli's Jamie Clarke - with a 54 break in frame two being the highlight for the Sheffield man.
Gary Wilson secured a 4-2 triumph over Ukrainian Julian Boiko while Robbie Williams beat former world number one Ding Junhui by the same scoreline.
Williams raced into a 2-0 lead, hitting a 54 break in frame one, although Ding levelled with scores of 88 and 66.
A stunning 119 break then put Williams on the cusp of victory, and the Wallasey-born 37-year-old battled to a 72-56 triumph in frame six to dump out 2012 champion Ding.
China's Xiao Guodong is out of the tournament despite compiling a break of 134. Xiao was beaten 4-3 by Barry Hawkins, while Scotland's Anthony McGill cruised past Long Zehuang 4-1.
Wales' Daniel Wells beat Barry Pinches 4-1 to book his place in the last 32, but another Welshman, Matthew Stevens, was beaten in the deciding frame by Ricky Walden.