LAGUNA SECA, California - Nicky Hayden will leave Ducati at the end of the 2013 season. Hayden (31) moved to Ducati in 2009 but has not won a race since 2006.Hayden said: "I'm not really sure what I'm going to do. I've some options that are interesting."'IT IS WHAT IT IS'Would he stay in MotoGP or look at other categories?Hayden said: "MotoGP is where my heart is but I must weigh up the options. Unfortunately results haven't gone as planned over the years, but it is what it is."Hayden, who won his Moto title with Honda, is ninth in the 2013 championship with 57 points after eight of 18 races. Team mate Andrea Dovizioso is sixth with 74.Cal Crutchlow, who is having a great season on the non-works Tech3 Yamaha and is fourth in the standings, has been tipped as a likely candidate to replace him.