A spot in the next round is at stake on Saturday, when Robin Montgomery goes up against Yue Yuan in the Hertogenbosch semifinal. Robin Montgomery is searching for form, having lost 3 in a row (3 of the last 10). Yue Yuan has won 5 of the last 10.

The two have never played — a first meeting always adds a layer of uncertainty the numbers can't fully capture.

Montgomery's 65.7% behind the first serve (against 62.5% for Yuan) means break chances should be scarce in one direction. Anything other than a Montgomery win would rank among the bigger surprises of the week.