Jensen was born in San Francisco, California. His parents divorced when he was five, and he was raised by his mother, who frequently moved the family. After serving in the Navy toward the end of World War II, he became an All-American in two sports at the University of California. As a baseball pitcher and outfielder, he helped California to win the inaugural College World Series in 1947. He pitched Cal to victory in the regional final by outdueling Bobby Layne of Texas, and in the championship Cal defeated a Yale team featuring future President George Bush. As a football halfback, Jensen was a consensus All-American as a junior in 1948, becoming the first Cal player to rush for 1,000 yards. In the season-ending 7–6 victory over Stanford he ran for 170 yards, kicked a punt for 67 yards, and had a 32-yard run late in the game in a 4th-and-31 situation. Cal ended the regular season at 10–0 under coach Pappy Waldorf, winning a share of its first Pacific Coast Conference title in ten years, and Jensen placed fourth in the Heisman Trophy voting, with Doak Walker taking the award. In the 1949 Rose Bowl, Jensen scored a touchdown in the first quarter to tie the game 7–7, but fourth-ranked Cal was upset 20–14 by seventh-ranked Northwestern.\n', '

In 1949, Jensen, who batted and threw right-handed, left college after his junior year and signed with the Oakland Oaks in the Pacific Coast League. His contract – along with Billy Martin\'s – was sold to the New York Yankees in 1950 with the intention of him being a backup for Joe DiMaggio. But he played in only 108 games for the Yankees over three years, primarily in left field. He appeared as a pinch runner for Bobby Brown in the eighth inning of Game 3 of the 1950 World Series against the Philadelphia Phillies, but was in the game only briefly before Johnny Mize popped up to end the inning. Jensen did not stay in the game defensively, and the Yankees completed a sweep of the Phillies in Game 4; he did not appear in the 1951 Series against the New York Giants.\n', '

Following the arrival of Mickey Mantle with the Yankees, in May 1952 Jensen was sent to the Washington Senators in a six-player deal, and he made his first All-Star team. He finished the season with a .286 batting average and 80 RBIs, leading the league with 17 assists and placing third in the AL with 18 steals, a total he duplicated in 1953. He was traded to the Red Sox in December 1953, and led the AL with 22 steals in 1954, also finishing third in RBIs (117) and fourth in home runs (25). But despite his speed he also set a major league record by grounding into double plays 32 times, breaking Bobby Doerr\'s 1949 total of 31; the record would stand until Jim Rice grounded into 36 double plays in 1984. No longer facing the pressure of becoming his team\'s principal star, Jensen again made the All-Star team in 1955, leading the league with 116 RBIs and finishing tenth in the MVP vote.\n', '

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