SB 10.44.26

tataḥ kūṭam anuprāptaṁ
 rāmaḥ praharatāṁ varaḥ
avadhīl līlayā rājan
 sāvajñaṁ vāma-muṣṭinā
Word for word: 
tataḥ — then; kūṭam — the demonic wrestler Kūṭa; anuprāptam — appearing on the scene; rāmaḥ — Lord Balarāma; praharatām — of fighters; varaḥ — the best; avadhīt — killed; līlayā — playfully; rājan — O King, Parīkṣit; sa-avajñam — neglectfully; vāma — left; muṣṭinā — with His fist.
Translation: 
Confronted next by the wrestler Kūṭa, Lord Balarāma, the best of fighters, playfully and nonchalantly killed him with His left fist, O King.