Aidan O’Brien never has won the Breeders’ Cup Juvenile Fillies Turf, but he starts the favorite Friday at Newmarket for the Group 2 Rockfel Stakes, a Breeders’ Cup Challenge Win and You’re In for the Juvenile Fillies Turf in November at Keeneland. Monday was favored Thursday in overseas antepost wagering for the Rockfel, one of four important 2-year-old races Friday and Saturday at Newmarket. Saturday’s card includes two Group 1s, the Cheveley Park for fillies and the Middle Park, both over six furlongs, and the one-mile Royal Lodge, another BC Challenge race, this for the Juvenile Turf. Monday was supposed to be second banana to favored stablemate Most Beautiful in a listed stakes race over seven furlongs Sept. 12 at Leopardstown, but Monday, by Fastnet Rock, raced near the front under Seamie Heffernan and won by three-quarters of a length, beating 10 rivals. Monday had finished fourth in her debut and lone previous start and seemed to decidedly prefer the good ground she got last time to the soft turf in her first start. Ryan Moore takes the mount Friday in this seven-furlong contest at Newmarket, where the ground was good as of Thursday. In terms of preferred turf condition, Isabella Giles, the strong Rockfel second choice, might be just the opposite. She showed ability over good going in her first three starts but her standout seven-length win in the Group 3 Prestige Stakes on Aug. 29 at Goodwood came on soft going. :: Want to get your Past Performances for free? Click to learn more. Only three others were entered in the Rockfel, which has a scheduled post time of 10 a.m. Eastern. For Saturday, Minzaal and Method are early co-favorites for the Middle Park. Minzaal won the Group 2 Gimcrack Stakes at York in his most recent start, that victory coming on the heels of a Salisbury maiden-race win, but the Gimcrack might not have been much of a race. Runner-up Devilwala finished seventh of eight in his next start, the Mill Reef Stakes, while third-place Mystery Smiles returned to finish third over the all-weather track at Kempton Park in a stakes race won by Mighty Gurkha. Method, the other Middle Park early favorite, faced Mighty Gurkha in the listed Rose Bowl Stakes on July 18 at Newbury and beat him by more than two lengths following a romping debut score, and Frankie Dettori is set to race-ride Method for the first time Saturday. Irish shipper Lucky Vega and Group 3-winner Supremacy were the only other Middle Park starters priced at less than 10-1 Thursday. The Cheveley Park appears to be similarly contentious, with Dandalla a narrow favorite over Miss Amulet. Dandalla has three wins from three starts, including a success in the Group 2 Duke of Cambridge Stakes going six furlongs at Newmarket in July, but she debuted June 2 and fillies that precocious often don’t improve much into the autumn. Miss Amulet also started in early June but didn’t win her first race until her third start and, six races into her campaign, has improved as the season has gone along. She’s handled a variety of course conditions and in the Group 2 Lowther Stakes on Aug. 20 at York showed she can handle a distance as far as six furlongs. Umm Kulthum, priced Thursday at a general 6-1, was third to Miss Amulet at York but improved her rating subsequently winning at Ayr and could come forward again. The Royal Lodge over a straight mile drew only five entrants, including Ontario from Aidan O’Brien, who has won this race the last two years with Royal Dornoch in 2019 and Mohawk in 2018. Ontario has one win from five starts and would not appears to rank near the very top of O’Brien’s 2-year-old prospects, though he is listed at 7-2 in a race without anything like a standout. Cobh, New Mandate, and Gear Up, the latter two for two in Ireland for trainer Jim Bolger, all rate a solid enough chance.