He ran at the 2010 Rome Marathon and finished in sixth place.[4] In 2011, he was the runner-up at the Los Angeles Marathon, ending the race with a time of 2:09:26, which was almost three minutes after the race winner Markos Geneti.[5] Manza won the Gold Coast Marathon in 2011, with a new race record of 2:10:01.[6] He improved his personal best time to 2:06:34 hours at the 2011 Amsterdam Marathon, finishing in fourth place.[7] He entered the 2011 Honolulu Marathon, but withdrew early on in the race due to pain in his Achilles tendon.[8] He ran at the Lake Biwa Marathon in March 2012, but did not finish this race either.[9] At run of 2:08:28 brought him fourth place at the 2012 Berlin Marathon.[10]