Frederick Engels extended his stakes-winning streak to two races, and the mare Crystal Capella won her first career stakes against males in Group 2 stakes at Newmarket, England, on Thursday.Frederick Engels, sent off at 7-4, won the six-furlong July Stakes by a length over 6-4 favorite Roman Emperor. Ridden by Eddie Ahern, Frederick Engels was always near the front and took the lead in the final furlong, holding off the favorite. Bannock finished third in the field of seven.Frederick Engels, a British-bred colt by Iceman owned by Pearl Bloodstock, won the Windsor Castle Stakes at Royal Ascot in June and has won three consecutive races, and 3 of 5 starts in his career. He will be considered for the Group 2 Gimcrack Stakes at York on Aug. 19, trainer David Brown said. Crystal Capella gave perhaps the finest performance of her career to win the Princess of Wales’s Stakes over 1 1/2 miles on turf. Ridden by Ryan Moore, Crystal Capella rallied from off the pace to take the lead with a quarter-mile remaining and won by eight lengths over Redwood, the winner of the Grade 1 Northern Dancer Stakes at Woodbine last September.Crystal Capella has won five stakes in her career, and the Princess of Wales’s Stakes was her first win since Group 2 Pride Stakes for fillies and mares at Newmarket last October. Owned by Sir Evelyn De Rothschild, Crystal Capella gave trainer Sir Michael Stoute his eighth career win in the Princess of Wales’s Stakes, and fourth win in the last seven runnings.A 6-year-old British-bred mare by Cape Cross, Crystal Capella could make her next start in the Group 1 Yorkshire Oaks over 1 1/2 miles at York on Aug. 18, a race open to older fillies and mares.