Lemma began his running career at the age of 17 and initially competed barefoot due to a lack of running shoes.
In 2016 he lowered his best to 2:05:16 in Dubai.
- "Sisay Lemma (Ethiopia)" (PDF). dubaimarathon.org. Dubai Marathon. Retrieved 10 May 2016.
- Pavitt, Michael (15 October 2015). "Sisay Lemma Kasaye and Koren Jelela named as late additions to Frankfurt Marathon elite fields". insidethegames.biz. Retrieved 10 May 2016.
- "Sisay Lemma Kasaya wins Warsaw marathon". Radio Poland. 21 April 2013. Retrieved 10 May 2016.
- IAAF: Lemma and Neuenschwander take the honours at the Vienna City Marathon. April 12, 2015
- Frankfurt Marathon: Arne Gabius bricht deutschen Rekord mit 2:08:33 Stunden, Äthiopier Sisay Lemma und Gulume Tollesa siegen in Frankfurt Archived 2015-10-27 at the Wayback Machine October 25, 2015
- "Lemma and Tollesa Achieve Historic Ethiopian Double at Frankfurt Marathon". IAAF. 25 October 2015. Retrieved 10 May 2016.
- "23rd Ljubljana Marathon: Ethiopian Lemma Kasaye and Kenian Visiline Jepkesho broke the record". 28 October 2018.
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