INDIAN WELLS, Calif.—Mackenzie McDonald is healthy again. Happy again, too. Two weeks ago, at the BNP Paribas Open, the soon-to-be 30-year-old won his first main-draw match at a Masters 1000 ...

Nick Kyrgios reacts during his first-round match against Mackenzie McDonald at the Miami Open on Wednesday. AP Australian Nick Kyrgios came from behind to defeat Mackenzie McDonald 3-6 ...