In a battle of big servers, Argentina’s Juan Martin Del Potro beat Croatia’s Ivo Karlovic 6-4, 6-7 (6), 6-3, 7-5 on Friday to leave the two teams tied at 1-1 following the opening singles matches in the Davis Cup final.
Del Potro, the 2009 U.S. Open champion who is capping a comeback after two injury-hit years, made the crucial break in the 11th game of the fourth set.
Karlovic, who at 37 became the oldest man to play singles in a Davis Cup final in nearly a century, served 35 aces while Del Potro had 15.
Doubles are played Saturday while reverse singles are scheduled Sunday. Croatia won the opening singles rubber after Marin Cilic struggled past Argentina’s Federico Delbonis 6-3, 7-5, 3-6, 1-6, 6-2.