Elise Mertens and Leylah Fernandez meet in the round of 16 at Tokyo on Thursday. Elise Mertens has won 5 of the last 10. Leylah Fernandez comes in at 7 wins from the last ten.

On paper it's close: comparable ratings, comparable serve numbers, small margins everywhere. This one is close to a coin flip, and the lean toward Mertens is exactly that — a lean.