Seattle Mariners prospect Edwin Diaz pitched for the 2014 Clinton LumberKings. (Photo by Craig Wieczorkiewicz/The Midwest League Traveler)

Former Clinton LumberKings pitcher Edwin Diaz made his major-league debut for Seattle on Monday, providing a glimmer of hope for Mariners fans during his inning of relief.

Diaz made his debut in the 7th inning against the Cleveland Indians at Seattle’s Safeco Field. He pitched a 1-2-3 inning, walking off the mound to a standing ovation after throwing 10 of 11 pitches for strikes. His fastball topped out at 101 mph.

Diaz was a starter when he pitched for the LumberKings. He went 6-8 with a 3.34 ERA, 111 strikeouts and 42 walks in 116 innings (24 starts) for the 2014 team. He was moved to the bullpen earlier this year while still pitching for the Double-A Jackson Generals.