I am not a fan of Henin, and I hate to give the Serena hating trolls like TMF some fodder but lets be fair to her:
1. In 2002-2003 (Serena's absolute peak, other than maybe the last several years) Henin scored 3 wins over Serena. Most of the other top players, Venus and Capriati included, had 0. No other player had more than 1. Yes they were all on clay, but just like with Nadal are we going to pretend clay isnt tennis (it is not secret like Nadal, most of Henin's greatness is built on clay, and the rest is merely back up).
True for that time-frame (at least on clay) Henin was Serena's best rival. The difference between this and the Nadal-Federer rivalry from 2004-2006 is that Nadal actually had wins over Federer on hard courts as well.
2. Beating Serena 3 times in slams on 3 different surfaces in the same year is remarkable no matter how you spin it. Serena lost in the quarters all 3 times, so she couldnt have been playing that badly.
Well there is no doubt that she did play very badly in the French Open and US Open matches against Henin. However, that was largely due to Henin's consistent play and not letting Serena dictate.
The only person who could beat her in slams this year was Henin it turned out. The slam Henin doesnt play Serena wins, the 3 Henin plays Serena goes out to her.
Not necessarily. Serena very nearly lost to Daniela Hantuchova at Wimbledon. In fact, if there wasn't a rain delay after Serena's injury, she would have lost. Wiki says this about her encounter in the next round:
In the quarterfinals, Williams faced world no. 1
Justine Henin. Henin won the first set, just to see Williams comeback to win the second set. Henin then served for the match in the seventh game but Williams came back, however it wasn't enough as Henin served out the match in the ninth game to advance.
[38] Williams was suffering from the injuries sustained in the previous round.
[39] Williams who claimed she played at 40% was criticized by
Michael Stich for claiming after the match that she would have beaten Henin had she been healthy.
[40]
Have to give it to Justine, she was the queen that year, and it was Serena's year of returning to somewhat top level tennis even if not all the way back yet.
I agree. Henin was unstoppable in 2007. Her Wimbledon loss to Bartoli was truly astonishing, but a fluke.
3. Had they ever played in 2004-2006 Henin would have been the heavy favorite, much more so than 2007. Just as Henin retired, avoiding a string of likely defeats to Serena, Serena was fortunate while she was doing so poorly for her standards to not play Henin at all.
I'm not sure if I agree with that. Serena didn't play for most of that period due to injuries, personal tragedy, and loss of interest. She wasn't committed to the sport in those three years, which is why she didn't run into Henin (or hardly anyone else) in that period. We can't say what would have happened if she was playing consistently those years because we'd also have to assume that she was healthy, and physically & mentally fit. A healthy and mentally fit Serena wins against Henin most of the time (except on clay). And it was Serena's devastating 6-2; 6-0 win over Henin in Miami (2008) that seemed to drive Henin into retirement. I know it really wasn't, but that's what it looked like when Henin (who was 3 time defending champion) suddenly retired before the French Open.