GUADALAJARA, Mexico, Oct. 25–Pan American Games jumping starts Wednesday with horses and riders from 17 nations including 12 teams seeking to qualify for the Olympic Games in London next year…

Lars Petersen, still a Danish citizen but one of the most prominent trainers in the United States, said he was “happily surprised” to be offered Gredstedgårds Casmir to ride for Blue Hors stud for whom he competed their horses in…