This article originally appeared on ABACUS Los Angeles Valiant and New York Excelsior were at the top of their respective divisions heading into the Overwatch League playoffs. But all that good work during the season meant nothing in the playoffs, as both teams were soundly defeated in the first match of their best-of-three semi-finals. The day of the underdogs started with the sixth seed Philadelphia Fusion facing off against top seed New York Excelsior , arguably the best team in the entire league. Excelsior has only lost six matches the entire season, and most casters and analysts predicted an Excelsior victory. But on Wednesday night, Fusion was the better team. The first map was very, very close. Excelsior only needed to push the payload just a couple of meters further, but couldn’t do it in time. It also showed how the rest of the games would go -- right down to the wire. Excelsior’s individual players played great games. Saebyeolbe’s Tracer and Pine’s Widowmaker got several extremely skilled pulse bombs and headshots on Fusion’s team. Overwatch League MVP JJoNak was pulling off kills and massive heals left and right. But their strong individual performances couldn’t beat Fusion’s teamwork. Throughout the three matches in the best of five series, Excelsior as a whole found it tough to crack a hole in Fusion’s tight, methodical siege. (Pine also switched off Widowmaker.) And when it was Fusion’s time to defend, its aggressive, scrappy plays stopped Excelsior short of winning objectives. It was that amazing ability to hold the enemy at bay that gave Fusion the 3-0 win in its first match against Excelsior. We're not afraid of New York. Time to finish the job on Saturday. #Unleashed pic.twitter.com/aQSQIARMHQ — Philadelphia Fusion (@PHL_Fusion) July 19, 2018 It was the same gripping, close-call action in the other semi-final between second seed Los Angeles Valiant and fifth seed London Spitfire . There were a few moments where it seemed like Spitfire was slipping, with a few mistimed ultimates, and players getting caught out. Valiant even managed to defeat Spitfire on the third map (King’s Row) and get a tie on the fourth one (Hanamura). But Valiant wasn’t able to flip the momentum and capitalize enough on those mistakes. After a slight lull in the middle of the match, we take Dorado to win the first semifinal match against the @LAValiant 3-1! We'll be back for the decider match on Friday! #GGWP #AcesHigh pic.twitter.com/QgHnUGjYVD — London Spitfire (@Spitfire) July 19, 2018 The deciding game had the two teams starting off with the same six heroes. No mismatches here -- this came down to the mechanical skills of the players. Spitfire’s two damage dealers Birdring and Profit proved themselves the better duo that night, while tank Gesture didn’t die once when the team was on the attacking side. This is an exciting start to the Overwatch League semifinals. Both lower seeds are on the verge of advancing. Either they’ll pull it off and achieve an upset… or we’ll see the two big guns come out firing. After all, Excelsior and Valiant can’t afford any more mistakes from here: One more defeat and they’re going home. If Valiant wants to win, it needs to adapt to the meta, quick. They also need to fall back on the strong mental strength it’s shown throughout the series, and not get deflated by this upset. Meanwhile, Spitfire will have continue their decisive gameplay on Friday night if they want to take it all the way though. There have been some dicey moments when it seemed like they weren’t sure how to handle a more aggressive approach by Valiant. The two will face off again Friday 7pm ET, while Fusion and Excelsior will be playing Saturday 7pm ET. We’ll see if the underdogs can pull off another surprise. For more insights into China tech, sign up for our tech newsletters , subscribe to our Inside China Tech podcast , and download the comprehensive 2019 China Internet Report . Also roam China Tech City , an award-winning interactive digital map at our sister site Abacus .