History is being written at the Madrid Open, and it’s not just about who lifts the trophy. The men's semifinals are set, and two of the sport's biggest stars—Jannik Sinner and Alexander Zverev—have already achieved something no other pair has ever done.

For the first time since the ATP Masters 1000 format began in 1990, two players have reached the semifinals at five or more consecutive events in the series. That’s right: Sinner and Zverev are now in a league of their own, a testament to their consistency and dominance on the biggest stages in tennis.

Let’s break down the matchups. World number one Jannik Sinner will take on rising star Arthur Fils for just the second time. Sinner won their only previous meeting, but Fils is hungry for his first Masters 1000 final appearance. On the other side of the draw, Alexander Zverev faces Alexander Blockx—a first-time meeting that promises fireworks. Blockx, like Fils, is chasing his maiden final at this level.

Sinner’s path to the semifinals has been impressive. After dispatching 19-year-old Rafael Jodar—who had been enjoying a dream run in front of his home fans—Sinner also beat Andrey Rublev. That victory locked in his world number one ranking through June, adding another milestone to an already stellar season. He now holds a 1-0 record over Fils and has his sights set on a fifth straight Masters title, a feat only Novak Djokovic and Rafael Nadal have matched.

Zverev, meanwhile, continues to be a force in Madrid. He breezed past Tommy Paul 6-4, 6-4, then followed it up with a 6-1, 6-4 win over Flavio Cobolli. The German has now reached six consecutive semifinals at this event, a run of consistency that few can rival. His form has been steady across seasons, and he’s showing no signs of slowing down.

This historic achievement by Sinner and Zverev puts them in elite company. The record for most consecutive Masters 1000 titles won without missing an event is currently a three-way tie at four: Sinner, Djokovic, and Nadal. Djokovic actually won five in a row between 2014 and 2015, but that streak included a missed event. Sinner is now aiming to break that tie and claim the outright record.

As the Madrid Open heads into its final weekend, all eyes are on these two titans. Will Sinner continue his reign, or will Zverev add another chapter to his Madrid legacy? One thing’s for sure: we’re witnessing something special.