SAN FRANCISCO – Tyler Mahle isn’t stretched out far enough yet to be able to pitch deep into games, which was why his first start for the Giants ended after four innings Saturday.In the brief time he was on the mound, however, the 31-year-old right-hander did enough to show that he’s headed in the right direction, and it shouldn’t be long before he’s ready to shoulder a bigger load.Mahle threw 80 pitches — five fewer than the coaching staff had penciled him in for — and allowed two runs and five hits. He walked one and struck out five of the 17 batters he faced.“Not great,” Mahle said of his outing to reporters at Oracle Park following the Giants’ third consecutive loss to begin the 2026 MLB season. “Just didn’t make pitches when I needed to. Split was good, fastball had some life. Just didn’t locate them like I wanted to in key situations.”On a day when he made his Giants debut after signing a one-year deal in the winter, Mahle was easily his own worst critic.He seemed happy with most of his pitches, but Mahle’s control was all over the map; Thirty of his 80 pitches were balls.In many ways,...