1992–1998: Breakthrough success
On January 27, 1992, Wynonna performed solo on television for the first time at the American Music Awards. She released "She Is His Only Need", the first single from her self-titled solo debut album. The album, Wynonna, was released in 1992 via MCA/Curb, under the production of Tony Brown. "She Is His Only Need" went to number one on the Billboard country singles charts that year, as did the album's next two singles, "I Saw the Light" and "My Strongest Weakness". "No One Else on Earth", was also the number one country song of 1992 according to Billboard Year-End. "She Is His Only Need" and "No One Else on Earth" were also minor Adult Contemporary hits, and the latter peaked at No. 83 on the Billboard Hot 100. "My Strongest Weakness", the album's final single, was a No. 4 country hit. The album shipped five million copies in the United States, earning a 5× Multi-Platinum certification from the RIAA.
Her second album, Tell Me Why, was released by MCA/Curb in 1993. Also a platinum-selling album, it accounted for five consecutive Top Ten hits on the country charts: the title track, "Only Love", "Is It Over Yet", "Rock Bottom", and "Girls with Guitars", which was written by Mary Chapin Carpenter. "Tell Me Why" was her third crossover hit, peaking at No. 77 on the pop charts and No. 24 on the Adult Contemporary charts. Between "Tell Me Why" and "Only Love", she sang guest vocals on Clint Black's 1993 single "A Bad Goodbye" (from the album No Time to Kill), which became her biggest pop hit at No. 43. The success of this song led to a tour called the Black & Wy tour, featuring Black and Wynonna as headliners.
In 1994, she also made an appearance on the Lynyrd Skynyrd tribute album Skynyrd Frynds covering the band's song "Free Bird". She also sang duet vocals on Michael English's debut single, "Healing", which peaked at No. 120 on the pop charts. English is a contemporary Christian singer. After "Girls with Guitars" fell from the charts, Wynonna was the subject of negative publicity, as she had a child out of wedlock. She was absent from the country charts for all of 1995. In 1996, she married Arch Kelly, the father of her daughter and son. Revelations is the title of her third album, released by MCA/Curb in 1996. Also certified platinum, this album had her fourth and final number one hit, the Mike Reid/Gary Burr co-written "To Be Loved by You". Despite the song's minor Adult Contemporary success, the album's other three singles did not fare as well:
Wynonna's fourth and final album for MCA is titled The Other Side. Unlike her previous country pop-oriented albums, this album focused on a more blues and rock sound. It was released in 1997 and produced four singles. The album did not sell as well as her first three, however, only earning a gold certification. Its singles were not as successful on the charts, either: although "When Love Starts Talkin'" and "Come Some Rainy Day" reached No. 13 and No. 14, respectively, "Always Will" fell short of Top 40 and "Love Like That" became the first single of her career not to chart at all. After the release of a greatest hits album called Collection, Wynonna left MCA in favor of Mercury Records.