MILAN, March 9 — Pervis Estupinan’s first-half goal proved enough for AC Milan to claim a 1-0 derby triumph at the San Siro yesterday and cut Inter Milan’s lead at the top of Serie A to seven points.

Inter could have moved 13 points clear with just 10 matches remaining in the season with victory, but instead Milan kept their title hopes alive and extended their unbeaten run against their city rivals to seven meetings in all competitions.