Friday's Stuttgart quarterfinal pits Frances Tiafoe against Jiri Lehecka on grass. Jiri Lehecka has won 7 of the last 10. Frances Tiafoe comes in at 8 wins from the last ten.
Frances Tiafoe leads the head-to-head 2-1, and history has a way of mattering in matchups like this one. On grass specifically it reads 1-0 Tiafoe — worth more than the overall number this week.
The underlying stats are tight across the board — this is a matchup decided by a handful of points. Tiafoe needs several things to break right at once; the percentages say they usually don't.