PHOENIX – The stars were out, the streets were quiet and Hayden Wesneski was fast asleep when he heard a knock on his bedroom door. It was his roommate and Triple-A Iowa teammate Matt Mervis, entering to tell Wesneski to check his phone. Wesneski was being called up. It was 1 a.m. in Des Moines.

Fourteen hours later, the 26-year-old Cubs right-hander stood in the visiting clubhouse at Chase Field, sleep-deprived but flush with adrenaline. He’d gotten some shuteye – at least as much as one can get on a plane – but he’d also just gotten 12 crucial outs. With Chicago’s bullpen also running on fumes, Wesneski had shut down a talented Diamondbacks offense for four scoreless innings to secure a 5-3, series-clinching win.

“It was probably our best pitching performance of the year,” said Cubs manager Craig Counsell.

It certainly was clutch. After two consecutive extra-inning games, and 10 2/3 innings from the relievers, the Cubs began the day desperate for fresh arms, which is why Wesneski and reliever Colten Brewer were summoned from Triple-A on such short notice. Wesneski arrived at the park roughly two hours before game time, low on rest but with the knowledge that he’d almost assuredly pitch. When Cubs starter Jordan Wicks left with one out in the fifth, Counsell went to Wesneski.

Over the next four innings, the righty stifled a Diamondbacks lineup that had scored 12 runs the night before. Relying primarily on a sweeper and a fastball that topped 97.5 mph, Wesneski allowed only one hit, a one-out double to Randal Grichuk in the sixth, and walked none. He struck out two and allowed only two balls to leave the infield. Counsell rode him all the way to the ninth inning – a stretch during which the Cubs managed to take a three-run lead – finally pulling the reliever after Grichuk popped out to start the final frame.