Kipchoge donated and signed the kit he wore when winning Berlin 2015 and Dibaba donated her uniform from Worlds.
The men's race in Berlin has produced a world record four times in the last seven years. With Dennis Kimetto (2:03:45 PB, #3 all-time), Emmanuel Mutai (2:03:52 PB, #4 all-time), Tsegaye Kebede (2x London champ, 2:04:38 PB) and world half marathon champ Geoffrey Kamworor all vying for the win, Wilson Kipsang's 2:03:23 WR from Berlin last year in in serious jeopardy.
Shalane Flanagan has said that her only goal is to break Kastor's record on Sunday and that everything else -- including winning the race -- is secondary to that. She has a good shot at her first major victory but will have company in the form of 2:21 women Feyse Tadese (Paris CR holder) and Tirfi Tsegaye (Tokyo CR holder, won Dubai in 2013).