MILWAUKEE -- Madison Bumgarner took the mound for Monday's opening-day assignment at Miller Park despite experiencing flu symptoms over the weekend.

Bumgarner did not appear sharp in the first three innings. He issued a bases-loaded walk for just the second time in his career, and allowed two-strike home runs to the Brewers' Scooter Gennett and Jonathan Villar, yet the Giants led 4-3 in the third inning.

Giants manager Bruce Bochy said Bumgarner was "pumped up" with medication and his condition had improved from Sunday, when he ran a slight temperature. Catcher Buster Posey had a similar ailment over the weekend, and didn't come to the park for Saturday's exhibition at Oakland.

MILWAUKEE, WI - APRIL 04:  Madison Bumgarner #40 of the San Francisco Giants pitches in during the second inning against the Milwaukee Brewers on Opening
MILWAUKEE, WI - APRIL 04: Madison Bumgarner #40 of the San Francisco Giants pitches in during the second inning against the Milwaukee Brewers on Opening Day at Miller Park on April 04, 2016 in Milwaukee, Wisconsin. (Photo by Mike McGinnis/Getty Images) ( Mike McGinnis )

The Giants also had problems with their charter flight Sunday, which delayed the team's arrival six hours past their planned 6 p.m. CDT arrival. While most of the club waited for a replacement jet to be flown in from Miami, the Giants ordered a small, 12-seat private plane to take the starting lineup along with Bumgarner. That plane endured weather-related delays, so Bumgarner and the starters ended up arriving at 11:30 p.m., just a half-hour ahead of the team.



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MILWAUKEE, WI - APRIL 04:  Brandon Belt #9 of the San Francisco Giants makes a sliding catch to retire Wily Peralta of the Milwaukee Brewers during the
MILWAUKEE, WI - APRIL 04: Brandon Belt #9 of the San Francisco Giants makes a sliding catch to retire Wily Peralta of the Milwaukee Brewers during the fourth inningon Opening Day at Miller Park on April 04, 2016 in Milwaukee, Wisconsin. (Photo by Mike McGinnis/Getty Images) ( Mike McGinnis )