The Minnesota Twins were 19-28 between April 16 and June 7 before going on a 34-8 surge that has culminated in a three-game sweep of the Chicago White Sox this week. The White Sox were as hot as the Twins for much of June, going 22-7 from June 6 through July 6, but now they are stuck in a 3-12 rut. In the American League West, the Los Angeles Angels of Anaheim were 8-12 from June 9 through the end of the month. They have the best record in the majors in July at 16-5. Over in the National League, the Atlanta Braves were a big league-worst 6-21 in June, posting their worst monthly winning percentage since April 1988. The Braves and Arizona Diamondbacks are tied with the best National League records in July at 13-6. By the way, the Diamondbacks have rebounded after going 3-20 from June 5-29. What accounts for such manic swings in wins and losses, which seem to be more marked this season than any this writer can remember? It seems fair to say that winning demands a combination of execution and the confidence to do it effectively. Confidence can be contagious, building and subsiding as a hitter succeeds and fails -- and sometimes several teammates experience the ups and downs together. Team chemistry is a bunch of bunk, isn't it? This writer hasn't put much weight in the notion of team chemistry, but teammates must feed off each other emotionally to some degree, considering how much time they spend together and how close many of them become over the six-month grind of a season. Could it be said that teams have mood swings?