Four days after the end of its most successful Turkish Airlines EuroLeague season ever, Anadolu Efes Istanbul has announced a new agreement with head coach Ergin Ataman, whose contract was extended until the end of the 2020-21 season. Ataman, 53, led Efes to a runner-up finish at last weekend's Turkish Airlines EuroLeague Final Four just one year after the club finished in 16th and last place in the competition -- marking one of the biggest turnaround's in basketball history at the elite level. Ataman had previously coached Efes from 1999 to 2001 and from 2008 and 2010. He guided the team to its first Final Four in 2000 and to the Turkish League title in 2009. Ataman also led Montepaschi Siena to the 2002 Saporta Cup crown and the 2003 EuroLeague Final Four. For five years, Ataman coached Galatasaray Odeabank Istanbul, with whom he won the 2016 7DAYS EuroCup crown as well as the Turkish League title in 2013. Ataman started his coaching career with Turk Telekom Ankara in 1996. He has also coached Fortitudo Bologna in Italy as well as Pinar Karsiyaka, Ulker and Besiktas in his native Turkey, winning the 2012 FIBA Euro Challenge and Turkish League titles with the latter. In addition, Ataman coached the Turkish national team from 2014 to 2016. He has coached in 224 EuroLeague games this century, with a 95-129 record (42.4% wins).