Former Open champ swings into contention with a third round 64 at Byron Nelson Invitational . Four players are tied for sixth on eight-under par , with Ireland 's Padraig Harrington , Aussie Marc Leishman , Graham DeLaet of Canada and Morgan Hoffmann of the U.S. all well placed to challenge for the $ 1.242 million first prize . Oosthuizen tied with America 's Brad Todd on 10-under par with one round remaining . Open winner Jan Kaymer five strokes back of Todd .
Former Open champ swings into contention with a third round 64 at Byron Nelson Invitational . Oosthuizen tied with America 's Brad Todd on 10-under par with one round remaining . Open winner Jan Kaymer five strokes back of Todd .