SAN FRANCISCO — For all of the advancements in analytics in recent years, there are still not a lot of great ways to judge a Major League Baseball manager.There is no version of WAR for the way he puts together lineups, and no such thing as Bullpen Moves Above Average. If you pull up Tony Vitello’s page on Baseball-Reference, you’ll see challenges (not great so far) and ejections (just one, perhaps a mild surprise).But you’ll also see the most traditional number there is, and the most important one. Vitello’s Giants are 13-18 through his first full month as manager, and that’s wildly disappointing, especially to him.Vitello has talked often in recent weeks about how he has struggled to adjust to the concept of losing so often. That might end up being the biggest change from Tennessee to San Francisco. There are a lot more games in the MLB season, which means a lot more sleepless nights for a manager who prides himself on being as competitive as it gets.The Giants are currently on pace for about 95 losses, and there’s plenty of blame to go around. Here are 10 numbers that stick out from a disappointing April (and a...