He claimed his first international title at the 2001 African Junior Athletics Championships in Réduit, winning the 10,000 metres event on August 16, 2001, and also winning the 5000 metres silver medal. He followed this up with a 10,000 m bronze medal at the 2002 World Junior Championships in Athletics, finishing behind Gebregziabher Gebremariam and Sileshi Sihine. At the 2003 IAAF World Cross Country Championships he won another junior medal, taking the bronze and a team gold with Kenya.
He made his marathon debut in 2005, competing at the New York City Marathon, but he did not manage to finish the distance on his first attempt. He made his mark in the senior ranks in 2006: he came second at the City-Pier-City Half Marathon behind Moses Kipkosgei Kigen, and then finished in third place in the Rotterdam Half Marathon, setting a new best of 1:00:13 for the distance. A month later he won the Amsterdam Marathon title in a time of 2:08:52. He took part in the Lagos Half Marathon in December and beat Francis Kibiwott to win the race with a sprint finish. His time of 1:03:18 was a minute off Fabiano Joseph's course record, but an organisational error meant runners had to fight through a traffic jam at the 14 km mark.
He ran at the prestigious RAK Half Marathon in 2007, but managed only tenth place. He was tenth in the Dublin Marathon in 2009, and ninth at the 2010 Prague Marathon. He recorded a new personal best at the Košice Peace Marathon later that year by finishing in a time of 2:08:40, which brought him second place some seven seconds behind race winner Gilbert Chepkwony. Both runners comfortably improved the Slovakian all-comers record by over a minute, a mark set by William Biama at the competition three years earlier. He ended the year with a third-place finish at the Honolulu Marathon. He ran two marathons in 2011: he had a win at the Milano City Marathon in hot conditions in April, but finished the podium in fourth at the Shanghai Marathon in December.
|2002||World Junior Championships||Kingston, Jamaica||4th||5000m||13:36.97|
|2006||Amsterdam Marathon||Amsterdam, Netherlands||1st||Marathon||2:08:52|
|2009||Dublin Marathon||Dublin, Ireland||10th||Marathon||2:14:57|
|2010||Prague Marathon||Prague, Czech Republic||9th||Marathon||2:11:51|
- African Junior Championships. GBR Athletics. Retrieved on 2010-10-03.
- World Junior Championships. GBR Athletics. Retrieved on 2010-10-03.
- IAAF World Cross Country Championships. GBR Athletics. Retrieved on 2010-10-03.
- van Hemert, Wim (2006-10-15). Narrow win for Busendich in Amsterdam. IAAF. Retrieved on 2010-10-03.
- van Hemert, Wim (2006-03-25). Kigen, Staicu winners at City-Pier-City Half Marathon. IAAF. Retrieved on 2010-10-03.
- Zersenay Tadesse wins third Fortis Half Marathon equalling course record of 59:16. IAAF (2006-09-11). Retrieved on 2010-10-03.
- Thobi, Louisette (2006-12-14). Busendich denies Kibiwott, as runners battle with traffic in Lagos. IAAF. Retrieved on 2010-10-03.
- Butcher, Pat (2007-02-09). 58:53 Half Marathon World Record by Wanjiru in Ras al Khaimah. IAAF. Retrieved on 2010-10-03.
- Juck, Alfons (2010-10-03). Chepkwony leads three under 2:09 in Kosice. IAAF. Retrieved on 2010-10-03.
- Bushendich Solomon. Marathon Info. Retrieved on 2011-04-11.
- Sampaolo, Diego (2011-04-10). Bushendich and Mancini beat the heat in Milan. IAAF. Retrieved on 2011-04-11.
- Results December 2011. AIMS. Retrieved on 2011-12-23.