That's teh question that will be decided when these two 4x100 squads clash at the Harry Jerome Invitational on June 26-27.
Lyles also talked about Jamaican sprint dominance: "Doesn’t feel good. Seeing Americans, not at the top hurts my soul.”
Cooper won't face any legal action for multiple felony charges after his alleged involvement in two car robberies.
The time was the third fastest 1500 of her career and a Polish all-comers' record. Another Polish soil record went down to Ryan Crouser in the SP as he threw 22.27m to beat Tom Walsh and set the record for the most career throws over 22m in history. Renaud Lavillenie won the PV (5.81m), Sergey Shubenkov won the 110H twice, Canada's Commonwealth champ Christabel Nettegy upset Brittney Reese in the LJ (6.88m), and Poland's Anita Wlodarczyk and Pawel Fajdek both had upset losses in the hammer.
He faces 2:06-man Abayneh Ayele while last year's runner-up Tigist Girma (2:29:05) faces Gulume Tollesa (2:23:06) and Merima Mohammed (2:23:06).
Distance action includes Jenny Simpson vs Laura Muir in the 1500, a men's 1000 with Adam Kszczot vs Kenyans Kipyegon Bett and Ferguson Rotich and Pre Classic 2 mile winner Selemon Barega leading the 5k. Other highlights: Russia's Maria Lasitskene looks to extend her HJ win streak, Olympic champ Tianna Bartoletta vs world indoor champ Ivana Spanovic in the LJ, world champ Karsten Warholm vs world leader Abderrahman Samba in the 400H and a rematch between Murielle Ahoure and Dina Asher-Smith in the 100m.