PHOENIX -- Giants utility man Eugenio Velez, who was struck in the head by a foul ball Saturday night, felt good enough Sunday to be released from a local hospital and prepare to return to San Francisco with the team.

Velez, 28, sustained a concussion and a contusion when he was hit on the left side of his head by Pat Burrell's fourth-inning line drive into the dugout. Velez was sitting at the rear of the dugout and had his view of the incoming ball blocked by teammates who were leaning on the dugout railing.

"At the time, I was drinking Gatorade," Velez said, explaining that he was in the process of lifting the cup to his lips. Velez added that he felt "dizzy, but OK."

Velez went on the 15-day disabled list and was replaced on the active roster by infielder Ryan Rohlinger, who was recalled from Triple-A Fresno. This began the second Major League stint of the season for Rohlinger, who has hit .308 with five home runs and 27 RBIs in 46 games with Fresno.

Velez's improved condition relieved the Giants.

"It's nice to know that everything was going well," said right-hander Matt Cain, who stood nearby when Velez was struck.

Television images showed that the Giants looked emotionally shaken by the incident, understandably enough. Cain confirmed this, relating that players' attention was necessarily divided.

"We were hoping the ball hit the wall, and we saw it hit him," Cain said. "You wanted to try to figure out what's going on with [Velez] but you have to pay attention and make sure nothing comes in the dugout again. We're trying to find out as much as possible from the trainers, but we're also not trying to bug them because they're trying to get everything done."

Posey extends hitting streak to 18 games

PHOENIX -- One Hall of Famer down; one to go.

Buster Posey lengthened his hitting streak to 18 games with a first-inning RBI double Sunday against the Arizona Diamondbacks, breaking a tie with Orlando Cepeda (1958) for the second-longest hitting streak by a San Francisco Giants rookie.

The only player ahead of Posey on this list is Willie McCovey, who set the San Francisco-era record of 22 games in 1959.

Posey is not only a lock to capture National League Rookie of the Month honors, but he also has a strong chance of winning the league's overall Player of the Month award. He entered Sunday with a Major League-high 34 hits in July and ranked among the month's top five in the NL in batting average (.447), on-base percentage (.494), home runs (seven), slugging percentage (.789) and RBIs (22).

Wellemeyer wild in latest rehab start

PHOENIX -- Manager Bruce Bochy said Sunday that the Giants face a decision regarding right-hander Todd Wellemeyer, who appears to have regained his arm strength but not his command in a Minor League injury rehabilitation assignment.

Wellemeyer was the Giants' No. 5 starter until he strained his right quadriceps at Cincinnati on June 10, forcing him to the disabled list. Saturday, Wellemeyer allowed one run and two hits in 4 1/3 innings but walked six batters in Triple-A Fresno's 6-3 victory at Reno.

Bochy said that according to Fresno manager Steve Decker, Wellemeyer walked the leadoff batter in four out of five innings.

Bochy's next chat regarding Wellemeyer will be with Giants general manager Brian Sabean as they decide whether the right-hander needs another start or is ready to rejoin the Giants as a long reliever.