In 1980, Nicklaus recorded only four top-10 finishes in 14 events, but two of these were record-setting victories in majors (the U.S. Open and the PGA Championship); the other two were a tie for fourth in The Open Championship and a runner-up finish in the Doral-Eastern Open to Raymond Floyd via his chip-in birdie on the second hole of a sudden-death playoff. These victories and placements more than justified the work Nicklaus put in toward his game during the off-season.  Nicklaus set a new scoring record for the 1980 U.S. Open with an aggregate of 272, eclipsing his earlier record of 275 from 1967 over the same golf course. That record, while since having been tied by three other players, stood until Rory McIlroy's 268 in winning the 2011 US Open. This was Nicklaus's second major win at Baltusrol Golf Club. Nicklaus opened with a record-tying 63 in round one and fought off his playing partner of all four rounds, 1978 Colgate World Match Play Championship winner, Isao Aoki. Entering the final round, Aoki had caught Nicklaus after three consecutive rounds of 68, but over the course of the last day, Nicklaus pulled away by two shots. Each player birdied the final two holes for a dramatic finish. Aoki's aggregate of 274 was the lowest score for a U.S. Open runner-up. Nicklaus' win was his fourth and final victory in the championship, tying him with Willie Anderson, Bobby Jones, and Ben Hogan. Nicklaus referred to this win as "by far the most emotional and warmest reaction to any of my wins in my own country".  In the 1980 PGA Championship, Nicklaus set another record in winning the championship by seven shots over Andy Bean at the Oak Hill Country Club, largely due to exceptional putting. Nicklaus shot an even-par 70 in the first round followed by three successive rounds in the 60s over the difficult course, and was the only player to break par for the 72 holes. For the week, the field averaged 74.60 strokes while Nicklaus averaged 68.50. This was Nicklaus' fifth and final victory in the PGA Championship, which elevated him to record-holder for the most wins in the stroke-play era, and which tied him with Walter Hagen for the most wins overall, since Hagen's victories were all during the match-play era. Nicklaus' seven-shot winning margin remained the largest for the stroke-play version of the championship until Rory's McIroy's 2012 victory. This victory also made Nicklaus the only player since Gene Sarazen in 1922 and Ben Hogan in 1948 to win the U.S. Open and PGA Championship the same year (subsequently equaled by Tiger Woods in 2000).

Answer this question "Who was his partner?" by extracting the answer from the text above.
Isao Aoki.