Alexander Zverev and Jakub Mensik meet in the semifinal at French Open on Friday. Jakub Mensik is rolling — 8 straight wins, 9 of 10 in recent play. Alexander Zverev is rolling — 10 straight wins, 10 of 10 in recent play.

Alexander Zverev leads the head-to-head 2-0, and history has a way of mattering in matchups like this one. On clay specifically it reads 2-0 Zverev — worth more than the overall number this week.

The serve is where this match separates: Mensik has been winning 76.8% of first-serve points to Zverev's 73%, and on clay that gap compounds fast. This one is close to a coin flip, and the lean toward Mensik is exactly that — a lean.