The Giants called up their top prospect, Bryce Eldridge, on Monday with hopes of delivering a much-needed spark following a brutal six-game losing streak.San Francisco’s president of baseball operations, Buster Posey, revealed the part of Eldridge’s game that he enjoyed watching develop in the minor leagues.“First and foremost, it was watching his at-bats and watching him continue to really play good baseball,” Posey told NBC Sports Bay Area’s Alex Pavlovic and Kylen Mills on Monday before Eldridge’s season debut.“I mean, talk about the offense, but I think what I’ve been most impressed about with him, watching him closely [in] the last year and a half, is how hard he’s worked on his defense. We’ll see how much defensive time that he gets out there, but he put up some good numbers in Triple-A and hopefully, again, [become] one of those guys that can be productive and give us a boost offensively.”Although Eldridge started as the designated hitter in the Giants’ 3-2 win over the San Diego Padres, Posey shares the team’s vision of mixing and matching lineups, so the 21-year-old is...