It is difficult to look past a 4x400m squad that includes four women who have won Olympic titles in the event.

Their team might be lacking their two star performers from last year, but the USA is still the overwhelming favourite to win the women s 4x800m in Nassau.

Being the only nation in the world that holds distance medley relays with any regularity, it would be the biggest shock of the competition if the USA did not triumph in the newest addition to the IAAF World Relays programme.

European 200m champion Adam Gemili will line up for a pre-World Championships showdown with some of the world s best sprinters at the Sainsbury s Anniversary Games at Queen Elizabeth Olympic Park on 24-25 July, the London leg of the IAAF Diamond League.

Kenya s Bedan Karoki will defend his title at the Gifu Seiryu Half Marathon on 17 May, the IAAF Silver Label Road Race organisers announced on Tuesday (28).

The provisional entry lists for the IAAF/BTC World Relays, Bahamas 2015 are now available.