World junior champion Alfred Kipketer (1:44.33), the 2012 London Olympics bronze medallist, Timothy Kitum (1:45.45) and the World Relays silver medallist, Ferguson Rotich (1:43.92) and 2006 World junior silver medallist, Jackson Kivuva (1:45.40).

Rudisha, who won in New York with season’s best 1:43.58, is fresh from finishing second behind Nijel Amos from Botswana at Lausanne and London Diamond League meets.

(READ: Sum, Kiprop too hot to handle in London meet)

Rudisha was simply a pale shadow of the man who beat Amos to second place at the 2012 London Olympics where he improved on his own world record with new times of 1:40.91.

Rudisha’s performance has left many questioning whether the 2011 World Champion will rediscover his former glory before the Worlds.

Kiptoo’s time of 1:43.56 from his victory in Barcelona on July 8 adds a new twist to the rich field.