Tuesday's Beijing round of 16 pits Nikola Bartunkova against Sinja Kraus on hard. Nikola Bartunkova has won 7 of the last 10. Sinja Kraus has won 5 of the last 10.

The serve is where this match separates: Bartunkova has been winning 68.8% of first-serve points to Kraus's 58.9%, and on hard that gap compounds fast. Anything other than a Bartunkova win would rank among the bigger surprises of the week.