CLEVELAND — If the Cleveland Guardians nudge their way into the October picture, they’ll remember Sept. 4 as the day that saved their season.For the first time since Aug. 19, 1984 — when the Clint Eastwood thriller “Tightrope” was the No. 1 movie in the country — Cleveland walked off both ends of a doubleheader. Two dramatic, had-to-have-’em wins, four hours and 39 minutes apart.The Guardians completed furious comebacks in each game against the Detroit Tigers. A day that threatened their grip on the final wild-card berth and their bid to unseat the division-leading Chicago White Sox instead proved about as fruitful as possible.It began with a 64-minute rain delay and a feeble first frame from Logan Allen, with the Guardians’ bullpen already stirring a couple of outs into a 19-inning day. It ended with Travis Bazzana triumphantly slamming his helmet into the grass and then sprinting so far away from his pursuing teammates that reliever Hunter Gaddis gasped for air and “put the brakes on.”Along the way, the Guardians lost Chase DeLauter (right wrist sprain), Angel Martínez (left shoulder contusion) and Stephen Vogt (ejection). Gaddis, Erik Sabrowski and Daniel Espino submitted critical multi-inning efforts to save a bullpen with a cascade of moving parts.Brayan Rocchio smacked a tying grand slam and a walk-off home run to earn hero status in a 7-6 Game 1 win.