The Arizona Diamondbacks are in the midst of a stretch that most big-league clubs can only dream about, winners of six straight games, 20 of 25 since the All-Star break and 30 of 40 since late June. They’re fitting in quite well in the NL West, which is home to three of the game’s hottest teams. As pennant races around baseball heat up, the one out west looks like the best. San Diego has a 19-4 record since the All-Star break and Arizona is 20-5. The Dodgers aren’t playing poorly at all with a 15-9 record, but they’re struggling to hold their division lead.