PARIS — Marin Cilic has completed the lineup of quarterfinalists in the men's draw at the French Open after beating Fabio Fognini of Italy, 6-4, 6-1, 3-6, 6-7 (4), 6-3.
"Just a crazy match," the third-seeded Cilic said.
Fognini saved match point at 4-5 in the fourth set before forcing the tiebreaker.
Cilic made no mistake when the second match point finally came in the fifth set.
"It was just hanging by a thread," the Croatian said. "A couple of points decided it."
Juan Martin del Potro is into his first French Open quarterfinal since 2012, taming the big-serving John Isner, 6-4, 6-4, 6-4.
Isner served 12 aces but fell short of becoming the first American man to reach the quarterfinals since Andre Agassi in 2003.
The fifth-seeded del Potro reached the semifinals in 2009, the same year he won the US Open.
Defending champion Rafael Nadal has again reached the French Open quarterfinals in his bid for a record-extending 11th title at Roland Garros.
The top-ranked Spaniard beat unseeded Maximilian Marterer 6-3, 6-2, 7-6 (4). He has yet to drop a set at this year's tournament.
Nadal patted Marterer sympathetically on the chest at the net after winning on his second match point.
Nadal will next play 11th-seeded Diego Schwartzman, who rallied to beat Kevin Anderson 1-6, 2-6, 7-5, 7-6 (0), 6-2.
Anderson twice served for the match, at 5-4 in the third and fourth sets.