Wysocki began track competition in age-group races in the late 1960s, and continued her track career over a period of about 30 years, until she became a Masters (over-40) runner in 1997. Wysocki was a standout performer in the 800 m at Azusa High School in Azusa, California, winning the California State championship at 440 y and 880 y. She attended the University of Redlands, where she excelled at 400 and 800 m.
Wysocki first won fame in American middle-distance running when she upset Mary Decker to win the 1978 US Champsionships 800 m in 2:01.99. Wysocki scored another upset victory against Decker (now Slaney) at the 1984 US Olympic Trials, this time at 1500 m. Wysocki outsprinted Slaney to win the Trials in 4:00.18. At the 1984 Summer Olympics she finished sixth in 800 m and eighth in 1500 m.  She finished seventh in 1500 m at the 1995 World Championships in Athletics in Gothenburg.
In 1997, Wysocki set several Masters records at distances from 800 m – 5000 m on the track, and 5k and 8k road races. Her father, Willis Kleinsasser, was also a successful Masters athlete. Her brother, Alan Kleinsasser, ran 1:50.5 for 800 m and 3:52.2 for 1500 m, both school records at Caltech.
|880 y||2:10.7||1974 (High School)|
|400 m||56.8||1975 (College)|
|800 m||2:07.6||1975 (College)|
|800 m||2:03.95||1997 (masters)|
|1000 m||2:40.42||1997 (masters)|
|1500 m||4:08.69||1997 (masters)|
|5000 m||16:37.22||1997 (masters)|
- Ruth Wysocki profile at IAAF
- Ruth Wysocki profile at USATF
- Interview with Ruth Wysocki, 2007
- University of Redlands Track and Field Top Ten Performances
- Summary of accomplishments
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