Group 1 winner Al Riffa (Fr) (Wootton Bassett {GB}), a two-time winner at the highest level, leads the 16-strong G1 Qatar Prix de l'Arc de Triomphe field by Timeform ratings at 125, the company announced on Friday. Trained by Joseph O'Brien, the 4-year-old is rated four pounds inferior to Calandagan (Ire) (Gleneagles {Ire}), who finished second to Al Riffa's third behind City Of Troy in the G1 Eclipse earlier this season. Another rated higher is Goliath (Ger) (Adlerflug {Ger}), who is two pounds above the G1 National Stakes and G1...