Valentova and Collins meet in Philadelphia with the market treating both the winner and the length of the match as settled business. The total of 17.5 games prices a scoreline in the region of 6-2 6-3. That is a firm assumption about a match with two built-in reasons to stretch.
The heavier ball against the sharper return
Valentova has the bigger weapons and her first serve has looked convincing this week. The second serve is another matter: it was picked apart by Svitolina and it wobbled even in the more straightforward assignment against Tian.
Collins has spent the tournament setting the terms rather than surviving them, stepping in on second serves from the opening games. She also arrived here with a full day of rest, which her opponent did not get.
Where the games come from
The other issue is closing. In Prague, Valentova twice let winning positions slip in the back end of sets; in Cincinnati she failed to convert seven match points, including one on her own serve. That habit produces 7-5 and 6-4, not clean routs.
A comfortable straight-sets win around 6-4 6-3 already clears the number, and a Collins upset clears it with room to spare. The honest risk is the American's own delivery, where the double faults come in bunches and could hand over two quick sets, which is why this is a measured play rather than a maximum one.
Prediction: Total Over 17.5 games, odds 1.81
