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.