Watson opted to play as the Houston Rockets, led by 2017-18 MVP James Harden, whilst Deulofeu selected the Toronto Raptors, hoping to take advantage of their dynamic star Kawhi Leonard.
Deulofeu got off to a strong start and was leading the contest from the outset. The Spanish star was up by as many as nine points as the game reached the third quarter. The 15-6 score line prompted a stirring comeback by Watson, who nailed a three-pointer with Harden. The third quarter came to end with a jam from Watson with only 0.6 left in the quarter, making it a three point game.
Watson and Houston drew level on 21 apiece with a dunk from Clint Capela with only 46 seconds left on the clock. The game couldn't be decided in regulation with tie of 23-23 at the final buzzer.
In overtime, Watson took over with a couple of breakaway buckets which proved difficult for Deulofeu to deal with, eventually triumphing 33-27 to take his place in the semifinal, where he will face either Arsenal defender Shkodran Mustafi or West Ham United midfielder Manuel Lanzini.
After the game Watson said: "I was happy [with my performance] but this guy [Deulofeu] hustled me [...] he knows what he's doing."
Deulofeu was magnanimous in defeat, saying: "This guy [Watson] is very good. He plays too much!"