Aryna Sabalenka overcame a battling Elise Mertens to reach the Wimbledon quarter-finals on Sunday as Carlos Alcaraz geared up for a tricky test against volatile Russian Andrey Rublev.

Carlos Alcaraz faces a tricky test on Sunday against volatile Russian Andrey Rublev in his charge towards a third consecutive Wimbledon title, while Aryna Sabalenka looks unstoppable as she prepares to take on Elise Mertens.

Fritz and Mpetshi Perricard’s match, by contrast, was at the mercy of the most sacred and strange tradition of them all: the 11 p.m. curfew imposed on a sporting event beamed across the globe. Wimbledon is the only Grand Slam with an early bedtime, and the lights go out on time, every time, with no exceptions — almost.

Tiebreaker scoring is measured in points (e.g., 1, 2, 3, etc.). In the event two players or teams are tied 6-6 in a set, the tiebreaker set goes to the side who reaches seven points first with a winning margin of at least two points.

For the No. 5-seeded Fritz, it was a shorter workday after playing a pair of five-setters and one four-setter earlier in the tournament.

Top seed Aryna Sabalenka held off a challenge from Elise Mertens, defeating the 24th-seeded Belgian 6-4, 7-6 (4) on Sunday to move into the quarterfinals at Wimbledon.