Once considered a key person in SP, Amar Singh has entered the electoral battle for the first time from Fatehpur.
He is contesting on RLD ticket with the support of Congress.
Though Kalyan Singh is not in fray this time from Etah, his son Rajveer's future is at stake in the same seat.
Last time Kalyan won from Etah seat as an independent candidate.
In Farukkhabad, Union Minister Khurshid is faced with the challenge of retaining his seat.
BJP and BSP are contesting on all 12 seats, whereas Congress has not fielded candidates against Mulayam and Dimple.
In the 2009 elections SP won 4 seats, Congress 3, RLD 2, BSP and BJP one each.