Saturday's Shanghai semifinal pits Alejandro Davidovich Fokina against Alexander Zverev on hard. Alexander Zverev is rolling — 4 straight wins, 8 of 10 in recent play. Alejandro Davidovich Fokina is rolling — 3 straight wins, 8 of 10 in recent play.

Hold strength tells the story — 73.7% versus 67.3% on first-serve points in Zverev's favor. The edge belongs to Zverev — real, but not the kind you take for granted at this level.