Unseeded Frances Tiafoe, a resident of Riverdale in Prince George's County, finished with mixed results in the Miami Open on Tuesday. Tiafoe completed a suspended Monday match, upsetting 10th-seeded Tomas Berdych of the Czech Republic, 6-7 (2), 6-2, 7-6 (1). The match earned the College Park-trained player a spot in the Round of 16, where he was beaten by No. 6 seed Kevin Anderson of South Africa, 7-6 (3), 6-4. Also Tuesday, American John Isner upset second-seeded Marin Cilic of Croatia, 7-6 (0), 6-3, to reach the quarterfinals. The 14th-seeded Isner, who reached the Miami Open semifinals in 2015, never faced a break point in the match. He made an impressive 73 percent of his first serves to take down Cilic.