Welcome back to the Monday Tennis Briefing, where The Athletic will explain the stories behind the stories from the past week on court.This week, there was a first on the ATP Tour, a quest for world No. 1 hung on one shot and a rising talent made up for some lost time.If you’d like to follow our fantastic tennis coverage, click here.How did a generational takeover happen at the Canadian Open?It was “Retro Night” Saturday at the Canadian Open in Montreal, where during changeovers and in the walkways between courts the tournament spun classics by such luminaries as Michelle Branch, Smash Mouth, Vanessa Carlton and No Doubt. It was a great playlist. Not even tennis tournaments can resist the nostalgia for the 1990s and 2000s holding society hostage lately.As trendy as they were, Montreal’s throwback vibes were in direct opposition to the action on court this week, where the ATP Tour’s youths have taken over.In the wake of a raft of upsets and injuries to the more experienced players, the 2026 Canadian Open is the first ATP Masters 1000 event (one rung below the Grand Slams) to have a quarterfinal field made up of players born in the 2000s. At 25, American Brandon Nakashima is the elder statesman of the bunch, while Spaniard Rafael Jódar is the youngest at 19.This milestone puts some pressure on the generation just above them. If the guys in their late 20s aren’t going to take advantage of Jannik Sinner, Carlos Alcaraz and Novak Djokovic’s absence from big tournaments, the young players are happy to lap up the experience and rankings points.Why do tennis players change their rackets so often?Tifo SportsThe surge isn’t quite a movement. Not because the young players weren’t the ones beating the top seeds, or because some contenders were injured, but because the players involved have been serving notice to their elders for some time.“It’s interesting to look at. I think it’s cool, obviously, to see the ‘Next Gen’ do so well,” 23-year-old American Ben Shelton, who beat 19-year-old João Fonseca 6-3, 7-6(3) on Sunday to advance to the quarterfinals, said in a news conference.“I think it’s funny that it’s all kind of happening at once. But it is guys who’ve had massive breakthrough seasons and are continuing to inch towards the top of the game. So it’s something that I love to see. I’m a big fan of a lot of the guys who are still in the draw, you’ve got guys who went to college, young Americans, other guys that I’m friends with.”In the semifinals, Shelton will face 20-year-old Jakub Menšík of the Czech Republic, who last year won the Miami Open. Shelton is defending champion in Canada, and looking to even out a season full of high highs and low lows to claim his fourth title this year.The other quarterfinalists are less established than Shelton but have been working in the wings to overtake not just their elders, but players of their own generation, too.World No. 24 Arthur Fils, 22, returned from a stress fracture in his back in March to go on a tear before facing another injury setback ahead of the French Open. He’ll play Jódar in the blockbuster matchup of the quarterfinals.Jódar has claimed the most wins of any teenager within his first 50 ATP Tour matches in the Open Era, and if he reaches the final in Montreal, he will become a top-10 player for the first time. He only made the top 100 for the first time at the end of March.