The next year, Bonds's offensive production reached even higher levels, breaking not only his own personal records but several major league records. In the Giants' first 50 games in 2001, he hit 28 home runs, including 17 in May—a career high.  This early stretch included his 500th home run hit on April 17 against Terry Adams of the Los Angeles Dodgers .   He also hit 39 home runs by the All-star break (a major league record), drew a major league record 177 walks, and had a .515 on-base average, a feat not seen since Mickey Mantle and Ted Williams over forty years earlier. Bonds's slugging percentage was a major league record .863  (411 total bases in 476 at-bats), and, most impressively, he ended the season with a major league record 73 home runs. 
The Union Association survived for only one season (1884), as did the Players' League (1890), an attempt to return to the National Association structure of a league controlled by the players themselves. Both leagues are considered major leagues by many baseball researchers because of the perceived high caliber of play and the number of star players featured. However, some researchers have disputed the major league status of the Union Association, pointing out that franchises came and went and contending that the St. Louis club, which was deliberately "stacked" by the league's president (who owned that club), was the only club that was anywhere close to major league caliber.
"Without me realising it, it's done a lot for me. Not consciously. Like, say for example, when I stood looking at the swim in Wicklow last year, I genuinely would have said before I saw the course, 'Yeah, maybe I could do it', but when I saw the swim, then I said, 'I don't think I could ever be that comfortable'. I think the fact that we do that now as our training swim gives you confidence without you even realising it; that you can achieve things you didn't think that you could with a little bit of work and a bit of persistence and a bit of bull-headedness. It's given me that. And it's given me a love of the bike.