CINCINNATI -- Giants third baseman Pablo Sandoval singled to right field in the third inning Wednesday night against Cincinnati right-hander Bronson Arroyo to extend his season-opening hitting streak to 18 games. That matches the all-time Giants franchise record to start a season held by Johnny Rucker. Rucker began the 1945 season by hitting safely in his first 18 games.

Sandoval eclipsed Willie Mays' San Francisco record of 16 games with a hit in the ninth inning of Tuesday night's series opener.

Sandoval owns the longest current hitting streak in the Majors and is just four games shy of his own personal best of 22 games. He set that last season from June 19 to July 30.

"It means a lot for me and I'm happy, but I care more that we lost," said Sandoval after the Giants' 4-2 loss to the Reds. "I care more to win the games. For me it's more special to help my team win the game."

Sandoval is hitting .329 this season, second on the team to Buster Posey's average of .382.

Hacker could be Giants' Friday starter

CINCINNATI -- While the Giants have not officially announced any starters for this weekend's series against San Diego at AT&T Park, it looks like Eric Hacker will get the call for Friday night's opener.

Hacker's agent, Matt Sosnick, announced on his Twitter account that Hacker's contract will be purchased from Triple-A Fresno. Hacker, 29, is not on the 40-man roster. He is 4-0 this season for the Grizzlies with a 2.19 ERA in 24.2 innings pitched. Opponents have hit just .217 against him.

Prior to Wednesday's 4-2 loss against the Reds, Giants manager Bruce Bochy declined to elaborate on the club's plans for Friday, but he left some room for speculation.

"I have a good idea, but I don't think I can relay that to you yet," said Bochy. "I think you can figure out that on the roster there isn't much of an option."

The Giants have been hamstrung this week after a rainout at New York on Sunday forced them to play a doubleheader against the Mets on Monday. They next have an off-day Monday before a stretch of nine consecutive days playing, six of which will be at home against Miami and Milwaukee.

Arias brought up to bolster GIants' infield

CINCINNATI -- Joaquin Arias was told during the Fresno Grizzlies' game against Tacoma on Tuesday night that he was being called up to join the Giants. One red-eye flight and a couple of hours of sleep later, Arias was all smiles as he walked through the visitor's clubhouse in Cincinnati.

"I am happy to be here," said Arias, who left the West Coast on a 12:30 a.m. flight. "I'm ready to play. If I get a chance to play, I will try to do everything they ask me."

As pitcher Guillermo Moto, sitting next to Arias, noted, when a player gets called up to the big leagues, he's always ready to play.

Arias, 27, was one of the final cuts by the Giants in Spring Training after being a non-roster invitee. He batted .400 with 17 RBIs for Fresno following an offseason in which he was named the MVP of the Dominican Winter League with a .387 average. Arias played shortstop for Fresno but can play second and has also played some first base.

Giants manager Bruce Bochy said he expects Arias to be in the starting lineup Thursday in the finale of the three-game series against the Reds. Bochy said he could possibly give both shortstop Brandon Crawford and second baseman Emmanuel Burriss the day off.