France’s Gael Monfils, seeking his first ATP crown outside Europe, and Ivo Karlovic, nearing titles in consecutive weeks at age 37, advanced to the ATP and WTA Washington Open final in sweltering conditions Saturday.

The 29-year-old Frenchman, whose most recent of five career titles came in 2014 at Montpellier, ripped ill German teen Alexander Zverev 6-4, 6-0 in one hour.

Croatia’s 35th-ranked Karlovic fired 14 aces to defeat US fifth seed Steve Johnson 6-4, 6-4 in a match where temperatures on the court reached 140 degrees Fahrenheit (60 Celsius).

Belgian seventh seed Yanina Wickmayer, a 2009 US Open semifinalist, battled through the heat to oust Kazakh sixth seed Yulia Putintseva 6-4, 6-2.

She seeks her fifth WTA title Sunday against 122nd-ranked Lauren Davis, a 6-2, 6-3 winner over 173rd-rated Jessica Pegula.

Karlovic, averaging 20 aces a match, has not surrendered a service break this week.

Karlovic, 7-8 in ATP finals, won his seventh career title last week on Newport grass to become the oldest tour singles champion since 1979.