The San Diego Padres are off to a slow start this season, winning just two of their first six games. The Padres lost consecutive series to the Detroit Tigers and San Francisco Giants, and are off on Thursday as they hit the road for a trip to Boston and Pittsburgh. In addition to the Padres getting off to a slow start with their bats, the team has also not been as aggressive with their challenges as other teams. Major League Baseball implemented an ABS Challenge System this season, allowing each team to challenge balls and strikes throughout the game. Each team starts with two challenges, but retains them if they're successful. The Padres have not been quick to challenge, and that may have cost them a win in Monday's series opener against the Giants. With the Padres down 3-0 in the bottom of the ninth inning, Fernando Tatis Jr. took a 2-1 pitch that appeared high with a runner on first base and nobody out. The pitch was called a strike, and the Padres had a challenge in their back pocket.…