 Kọ itẹsiwaju fun paragirafi yii - Leiser pari kẹrin ni 4 × 400 m relay ni 2004 World Indoor Championships : , papọ pẹlu awọn ẹlẹgbẹ Alain Rohr, Cédric El-Idrissi ati Andreas Oggenfuss. Ni iṣaaju, lakoko jara naa, ẹgbẹ Switzerland kanna ti ṣaṣeyọri 3.04,09, igbasilẹ orilẹ-ede tuntun. 