The Worst Compatibility (Saiaku no Aishō!? [最悪の相性!?]) is the 58th episode of the proginal Prince of Tennis. It originally aired on the 20thj November 2002.
Neither Inui nor Kaido can react fast enough to Ohtori's Scud Serve. Even after Inui removes his weighted wrist bands; which granted him more speed, still wasn't enough to return the Scud Serve. As the Seigaku pair struggle, Keigo Atobe, Hyotei's captain, reflects back on how hard Shishido and Ohtori trained for this.