Born Tamara Kazachkova in Kazanovka in the Chelyabinsk Oblast, her first major tournament was the 1972 Summer Olympics in Munich. Aged 22, she failed to progress beyond the first heat of the 800 m. She established herself indoors at national level after this, taking the 1000 metres title in 1973 then the 1500 metres title at the 1974 Soviet Indoor Athletics Championships. She represented the Soviet Union in the latter event at the 1974 European Athletics Indoor Championships and came away with her first international medal, taking the bronze behind Bulgaria's Tonka Petrova and Karin Krebs of East Germany. The middle period of her career saw her drop in the national rankings, though she continued to improve. In 1976 she set personal bests of 1:58.7 minutes for the 800 m and 4:07.2 minutes for the 1500 m. She did not compete at a high level in the following two years. However, she returned with a new best of 4:06.3 minutes in 1979, marking a resurgence in her form and competing under her married name Tamara Sorokina. She was the second fastest woman of the 1980 indoor season, running 4:07.8 minutes to place behind only Mary Decker of the United States. Sorokina dipped under four minutes for the 1500 m for the first time in 1980 and ended the year with a best of 3.59.3 minutes, which ranked her eighth globally. She also won the Soviet indoor 1500 m title for a second time. However, such was the strength of the Soviet Union in the event, she did not earn selection for the 1980 Moscow Olympics, while her compatriots Tatyana Kazankina, Nadezhda Olizarenko and Lyubov Smolka all making the Olympic final instead. Entering her thirties, the 1981 season proved to be the high point of Sorokina's career. She won an 800 m/1500 m double at the Soviet Indoor Championships. She set personal bests in both events outdoors, running 1:57.55 minutes for the 800 m in August and 3.58.89 minutes for the 1500 m – both these times ranked her fourth in the world for the season. She was the Soviet representative in the 1500 m at the 1981 European Cup and she came away with the gold medal, recording a championship record of 4:01.37 minutes to beat East German Olympic medallist Ulrike Bruns. This ensured her place on the national team for the 1981 IAAF World Cup and she again finished ahead of Bruns, as well as future Olympic championGabriella Dorio. Her winning time of 4:03.33 minutes was a meet record which stood until 1994, when it was improved by Hassiba Boulmerka. Sorokina remained highly ranked in the 1982 season, including a lifetime best in the 800 m of 1:56.6 minutes. She again ran below four minutes for the 1500 m and her best of 3:59.24 minutes though slower than the previous year was enough to put her in the season's top ten. A Soviet trio of Sorokina, Olga Dvirna and Zamira Zaytseva were entered into the 1500 m for the 1982 European Athletics Championships. Her compatriots took the top two spots, but Sorokina failed to produce her season's best and finished in sixth place. This proved to be the last high-profile international appearance that she made. In her last year of competition in 1983 she ranked sixth in the world for the 1500 m.
