He beat his closest rival, Redwan Ebrahim, by 2:19 over the 49.5km course around Mekele, with Temesgen Buru a further 14 seconds back in third, giving Grmay his fourth national TT title.
Grmay, who turned pro with MTN-Qhubeka in 2013, rode his first Tour de France in 2016 while with Lampre-Merida, having already ridden the previous season's Giro d'Italia and Vuelta a Espana, and went on to ride his second Tour de France for Bahrain-Merida last year, finishing 73rd.
This season, having joined Trek-Segafredo, Grmay finished 24th overall at April's Tour de Romandie, and was 17th on the GC at the recent Critérium du Dauphiné.
Although competition is fierce at Trek-Segafredo for a Tour start, the 26-year-old's Grand Tour experience – Grmay has finished all five Grand Tours that he's started – and recent good form has to stand him in good stead of making it three in a row.
Thank you for signing up to Cycling News. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.