In the top third, Ryu picked up two more strikeouts, both of the swinging variety. Ryu fanned A's slugger Khris Davis to end the fourth inning on a cutter.

The A's broke Ryu's bid for a no-hitter with two outs in the fifth with Stephen Piscotty's single. But the lefty regrouped to get Jake Smolinski to pop out to second for the final out of the inning. And Ryu struck out Trayce Thompson and Marcus Semien to start the sixth, raising his K totals to eight for the day.

That's a single-game high for Ryu since April 30 last year, when he struck out nine Philadelphia Phillies.

After this encouraging start, Ryu's ERA dropped from 7.36 to 2.79.

This was Ryu's second career start in which he allowed just one hit. The first came Aug. 6 last year against the New York Mets.

Ryu threw 90 pitches, 60 of them for strikes. He had an excellent command with his cutter, and five of his eight strikeouts came on that pitch. Ryu also mixed in his curve and changeups with great effect, keeping the A's hitters off balance all game.

Ryu began the year as the Dodgers' fifth starter behind Clayton Kershaw, Rich Hill, Alex Wood and Kenta Maeda. Ryu's hold on the spot appeared more tenuous after his shaky outing against the Diamondbacks, as the Dodgers' top pitching prospect, Walker Buehler, is biding his time in Triple-A.

Buehler, a 23-year-old right-hander, struck out five in four innings in his first minor league start of this season last Thursday. (Yonhap)