Three men's javelin throwers set the tone with qualifying marks while Alaka and Williams lead the sprinters.
Texas will provide live streaming coverage of all three days of the Prelims.
Athletes must qualify through the two regional sites to make the final NCAA stop at Eugene.
USC hosts the conference championships for the third time and first since 2003.
A number of wins at today's Ken Shannon Invite set the Huskies up well for championship season.
High School and Personal: Born in Glasgow, Scotland ... parents are Alison and Brian Thoirs ... has one younger sister, Rosie ... his father played soccer and mother was on the track and ski team at St. Andrews University ... one of the top junior pole vaulters out of Scotland ... Scottish Under-20 indoor record holder at 16-9 ¼ ... competed at 2012 British Olympic Trials ... second at the 2012 British Junior Championships in the vault ... was seventh at the 2011 British World Championship Trials, clearing 16-7 ... the United Kingdom School Games Champion in 2009 ... represented Great Britain at the Youth Olympic Trials in Moscow in 2010 ... placed second at the British University Indoor Championships in 2012 ... the top-ranked junior in the UK indoors in 2012 and eighth among all vaulters with a PR of 16-9 ¼ ... was the top-ranked junior in the UK in 2011 at 16-6 ¾ ... Scottish Under-17 record holder outdoors with a vault of 15-1 ... trained with Glasgow City/Glasgow Uni/Team Glasgow in Scotland.
2013 MPSF - NH, Pole Vault
Pole Vault.......17-0 3/4