1991 U.S. Pro Indoor
| 1991 U.S. Pro Indoor | |
|---|---|
| Date | February 11 – February 18 |
| Edition | 24th |
| Category | Championship Series |
| Draw | 48S / 24D |
| Prize money | $825,000 |
| Surface | Carpet / Indoor |
| Location | Philadelphia, PA, United States |
| Venue | Wachovia Spectrum |
| Champions | |
| Singles | |
 Ivan Lendl [1] | |
| Doubles | |
 Rick Leach / Jim Pugh [2] | |
The 1991 U.S. Pro Indoor was a tennis tournament played on indoor carpet courts that was part of the Championship Series of the 1991 ATP Tour. It was played at the Wachovia Spectrum in Philadelphia, Pennsylvania in the United States from February 11 to February 18, 1991.
Champions
Men's Singles
Ivan Lendl defeated Pete Sampras 5–7, 6–4, 6–4, 3–6, 6–3 [1]
- It was Lendl's 1st title of the year and the 95th of his career.
- To reach the finals, Ivan Lendl defeated the following opponents: Round 1 (Bye), Round 2 (Guillaume Raoux), Round 3 (Gary Muller), Quarterfinals (Michael Stich), Semifinals (Brad Gilbert).[1]
Men's Doubles
Rick Leach / Jim Pugh defeated 
Udo Riglewski / Michael Stich 6–4, 6–4 [2]
- It was Leach's 1st title of the year and the 19th of his career. It was Pugh's 1st title of the year and the 20th of his career.
- To reach the finals, the Leach/Pugh pairing defeated the following opponents: Round 1 (Bye), Round 2 (Alfonso Mora & Nicolas Pereira), Quarterfinals (Neil Broad & Kevin Curren), Semifinals (Jim Grabb & Patrick McEnroe).[2]