Mark Selby 10-9 Michael White
Mark Selby overcame a late rally, sloppy play and one of the oddest frames in snooker history to win a decider over the young Michael White in the evening session, booking his place in the second round.
The former world No. 1 had dominated White coming into the evening session, going up 5-1 and 8-4 before losing four consecutive frames as his aggressive play led to too many unforced errors.
White's confidence started to grow as the Welshman aggressively started to attack long pots, and while the 22-year-old made plenty of errors of his own, Selby kept giving the youngster chances to get back into the frame.
Frame 17 saw several bizarre twists and turns, as the experienced Selby mistakenly played a shot on pink that wasn't free, to the shock of the crowd, the commentators and himself most of all. Selby couldn't believe his mistake and was visibly shaken in his next few pots, but in an even stranger twist, the error left the pink ball out of play, forcing a 20-minute standoff between the players on yellow.
Several bad safeties and two missed pressure pots later, White would make the final mistake that gifted the frame to Selby, who finally scored on his third pressure pot of the frame.
White took one back to force the decider, but Selby seized control in the 19th early and never gave the youngster any chance, nearly recording a century on his way to the next round.
Losing in such fashion will have been hard on White, but the youngster showed remarkable poise and fighting spirit and looks like he could develop into a fan favourite at the Crucible for decades to come.
Selby, meanwhile, looked fantastic during the early sessions but will need to clean up his game if he is to make a serious run at a World Championship win.
Ricky Walden 6-3 Kyren Wilson
Ricky Walden went from being down 3-1 to taking a 6-3 lead into Tuesday, as brilliant control of his safeties led to five straight frames and a relatively comfortable lead over 22-year-old Kyren Wilson.
Wilson had controlled much of the early proceedings with a few crucial, aggressive pots, but Walden adapted accordingly and started putting pressure on the debutant, leading to a handful of mistakes that turned the tie around.
A crucial miss on black up 63-0 in the final frame seemed to perfectly illustrate Wilson's evening session, as the youngster will need to recover going into the next day of competition.
But last year's semi-finalist seems to have excellent control of his game early in the tournament, unlike some of the other favourites for the title. And while he did struggle a bit early with Wilson's attacking play, he figures to be in complete control of this matchup.
Michael Wasley 10-9 Ding Junhui
Wasley and Ding were allowed to finish their match late in the evening, with the Englishman scoring one of the greatest upsets in Crucible history, defeating Chinese hopeful Ding in a decider.
Last year's World Championship saw only two deciders in total, but Wasley and Ding squared off in the fourth of this year's first round as the 24-year-old qualifier, who had needed a decider to make it to the main tournament, convincingly won the 18th frame when he scored a century, never giving his opponents much of a chance at the table.
Wasley continued his aggressive play into the final frame and went up early, but a miss on red and a short safety battle gave momentum back to Ding, who scored three wonder pots in the course of five shots.
Two near-identical shots on red and a difficult side-pot on pink seemed to turn the tide in favour of the Chinese superstar, who forced three consecutive penalties on a double-cushion snooker on red.
Wasley eventually found his shot, and the two went into the final portions of the frame with Ding sporting a sizeable lead. Eventually, some difficult ball-placement forced another safety battle with one red remaining.
Facing a near-snooker, Wasley attempted to play a little kiss on the final red and overshot his mark, only to see the ball go into the side pocket, setting the table for a final run. Wasley remained cool and seemed to put his opponent away for good, only to miss on pink, the final shot he had to make.
Incredibly, Ding was able to record three consecutive snookers off of long shots, refusing to go down. A double-play on his fourth attempt resulted in a makeable pot near the side cushion, however, and Wasley delivered.
The crowd erupted, Ding acknowledged his opponent and Wasley had difficulties controlling his emotions, as one of the greatest upsets in the history of the World Champions unfolded in a final frame that took all of 41 minutes.
Regardless of his opponent in the next round, Wasley will already be able to look back on arguably the most famous victory of his career. For Ding, this result is but the latest in a line of disappointing finishes at the Crucible, a tournament the player has never won.