Tyson Gay
It's currently unknown to the public what kind of condition Tyson gay is in, he just recovered from a surgery not to long ago. If he is just taking it easy like many suspect, he will probably take silver in the 100m, Gold if Bolt get caught slippin.
Keep in mind that there is only one instance in which bolt has ran a time faster than Tyson Gay's PR, which is the time he broke his own world record by dropping a 9.58, and that was back in 2009. His second fastest time after that is 9.69, which is also Tyson Gay's PR. Though, both of them have had to deal with injuries, especially Tyson.
Bolt progression
100 Metres 2012 9.76 -0.1 Roma 31/05/2012
2011 9.76 1.3 Bruxelles 16/09/2011
2010 9.82 0.5 Lausanne 08/07/2010
2009 9.58 0.9 Berlin 16/08/2009
2008 9.69 0.0 Beijing (National Stadium) 16/08/2008
I'm kind of worried about his condition though, if he was going to step it up the trials would have been the time, ah well, we will find out.
Bolt
If Bolt has been training properly, he should win both the 100m (as long as he gets a good start) and the 200m easily. He has enough top end speed to recover from a bad start in the 200m, but the 100m? nah.
Blake
Not much to say, dude is a beast, high chance of upsetting Bolt at the Olympics. I was suspicious at first, but maybe the nigga is just a late bloomer. /shrug.
Yohan Blake DOB:12/26/1989
200 Metres 2012 19.91 1.1 Kingston (NS), JAM 05/05/2012
2011 19.26 0.7 Bruxelles 16/09/2011
2010 19.78 0.1 Monaco 22/07/2010
2009 20.60 Kingston (NS), JAM 21/02/2009
2008 21.06 0.4 Kingston, JAM 15/06/2008
2007 20.62 1.0 Kingston, JAM 31/03/2007 - Blake at 17?
2006 20.92 1.2 Kingston (NS), JAM 25/06/2006
19.26? where the fuck he pull that from.
Usain Bolt DOB: 08/21/1986
200 Metres 2012 20.26 1.3 Kingston (NS), JAM 30/06/2012
2011 19.40 0.8 Daegu 03/09/2011
2010 19.56 -0.8 Kingston (NS), JAM 01/05/2010
2009 19.19 -0.3 Berlin 20/08/2009
2008 19.30 -0.9 Beijing (National Stadium) 20/08/2008
2007 19.75 0.2 Kingston (NS), JAM 24/06/2007
2006 19.88 0.4 Lausanne 11/07/2006
2005 19.99 1.8 London (CP) 22/07/2005
2004 19.93 1.4 Devonshire 11/04/2004 - Bolt at age 17 (has the world record for this age group)
Asafa Powell
Known as a chock artist, will medal if he finally brings his A game.
Justin Gatlin
Might medal depending on how the others run. His hungry, so I don't see him slipping up.