Ben Shelton, the No. 6 seed, enjoyed a routine win over Ignacio Buse in the first round of the US Open on Sunday. Joining him in advancing to the second round was fellow American and No. 4 seed Taylor Fritz, who defeated Emilio Nava in straight sets.

Florida Panthers star forward Matthew Tkachuk, 27, a key cog in the franchise’s two Stanley Cup runs the past two years, underwent surgery this month and is expected to miss the start of the regular season, an NHL source told ESPN, confirming a report.