Istanbul mayor Akram Imamoulu has emerged as the main opponent to the rule of Turkish President Recep Tayyip Erdogan. Both were footballers in their youth, and they experienced legal harassment while at the helm of Turkey's largest city.
However, while both share an ability to reach voters, there are significant political differences between them, writes CNN's Huseyin Akkoyunlu. The opposition dreams of a revolution, says Akkayunlu, but Erdogan wants to stay in power.