The U.S. military will have warships and transport aircraft at the ready in case American athletes and officials need to make an emergency escape from the 2014 Sochi Olympics.

A contingency plan has been established in case "something happens like a major terrorist attack and we need to get Americans out," an unnamed U.S. official told CNN.

Concerns about violence at the Games have run high since recent suicide bombings in nearby Volgograd killed 34 people. Sochi is located relatively near the North Caucasus region, where Islamist militants have waged a long, bloody insurgency.

Russian officials have insisted they can hold a safe Games, flooding Sochi with thousands upon thousands of police, troops and security personnel.

Tennis

Despite an early exit at the Australian Open because of an injured right ankle, John Isner is on the U.S. roster for its first-round matches against Wimbledon champion Andy Murray and Britain.

Isner, who is ranked 13th, quit after dropping the first two sets of his opening match at the Australian Open last week.

Joining him on the American roster announced Monday by U.S. captain Jim Courier are Sam Querrey and the doubles team of twins Bob and Mike Bryan. The matches are Jan. 31 through Feb. 2 in San Diego.

Baseball

New York Yankees shortstop Derek Jeter has resumed on-field work for the first time since his 2013 season was cut short.


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The Yankees captain hit off a tee in a batting cage and fielded 108 grounders on the grass in front of the infield dirt Monday at the Yankees minor league complex in Tampa, Fla.

Jeter, who turns 40 in June, was limited to 17 games last season after suffering a broken ankle during the 2012 playoffs.

College football

Fresno State has reached an agreement with coach Tim DeRuyter to extend his contract through the 2018 season. DeRuyter has led the Bulldogs to a 20-6 record in two seasons and the 2013 Mountain West Conference championship.

The Associated Press contributed to this report.