She earned a total of five medals in the Winter Olympics, including three golds (1988: cross country 4×5 km, 1992: biathlon 7.5 km, 1994: biathlon 4×7.5 km), one silver (1988: cross country 20 km), and one bronze (1992: biathlon 3×7.5 km). She is notable for performing the feat of being the only person on the planet to win Olympic gold medals in both cross country skiing and biathlon. Another curious fact about her is that she is one of the few sportspersons to win gold at three consecutive Olympics under three different flags, the first being the USSR in 1988, the second - Unified Team in 1992, and the third being the Russian Federation in 1994.
Reztsova also found success at the FIS Nordic World Ski Championships, earning three golds (4×5 km: 1985, 1987, 1999) and two silvers (1987: 5 km, 20 km). She also won one cross country World Cup and seven biathlon World Cups in her career.