World No 1 Aryna Sabalenka and Elena Rybakina on Wednesday set up a blockbuster semi-final at the Miami Open in a repeat of their Melbourne grand slam decider. Defending champion Sabalenka fended off big-hitting 45th-ranked American Hailey Baptiste 6-4, 6-4. World No 2 Rybakina overcame fifth-seeded American Jessica Pegula, a runner-up to Sabalenka last year, 2-6, 6-3, 6-4. They will be back on Thursday at Hard Rock Stadium — home of the N.F.L.’s Miami Dolphins — vying for a place in the final.