SEATTLE – Felix Hernandez, Seattle's prized 19-year-old prospect, pitched eight shutout innings in his second major league start and the Mariners beat the Minnesota Twins 1-0 Tuesday night.

Hernandez (1-1), who lost his first big league start 3-1 Thursday at Detroit, allowed five hits, all singles, and struck out six in besting Kyle Lohse (7-11) in a pitching duel. The young right-hander threw 94 pitches — 69 strikes — and did not walk a batter.

He was called up from Triple-A Tacoma last Thursday. At Tacoma, he posted a 9-4 record with a 2.24 ERA in 19 games and 14 starts.

In his two starts this season, he has an 0.69 ERA, with one earned run in 13 innings pitched.

Eddie Guardado pitched the ninth for his 27th consecutive save — and his second in two nights — and his 28th save in 29 opportunities.

The Mariners broke a scoreless tie with two outs in the seventh when Jeremy Reed doubled to right and rookie Yuniesky Betancourt tripled to center on consecutive pitches by Lohse. It was Betancourt's second RBI in his 10th major league game.

The last-place Mariners beat the Twins — who trying to hang on in the AL wild-card race — for the second straight night and dealt them their sixth consecutive road loss. Minnesota is 9-18 since the All-Star break.

Lohse lost his fifth decision in seven starts since posting his last victory June 2. But he pitched a strong game, too, allowing one run on four hits and two walks, with a season-high seven strikeouts.

The Twins loaded the bases in the fifth. Matthew LeCroy and Jacque Jones opened with singles before Lew Ford hit into a fielder's choice, with LeCroy being thrown out at third.

Hernandez struck out Justin Morneau swinging with a 97-mph fastball for the second out, but third baseman Adrian Beltre's throwing error on a ground ball by Terry Tiffee loaded the bases. Hernandez then got Jason Bartlett to ground out to end the inning.

Notes: Reed was caught stealing for the eighth time in 10 attempts. Reed had 59 stolen bases at Triple-A Charlotte and Triple-A Tacoma in 2004. ... Beltre is tied for the Mariners' lead with SS Mike Morse with 11 errors in 106 games. He had 10 errors in 157 games for the Los Angeles Dodgers last season.