st. ignatius' traditional rival is sacred heart cathedral preparatory, also located in san francisco. the si-sh rivalry began with a rugby game on st. patrick's day in 1893. si and sh compete against each other in football, basketball, and baseball for the bruce-mahoney trophy, which is named after bill bruce of si and jerry mahoney of sh, alumnus who died in world war ii. si has a significant edge over sh, with a winning record of 45-20 for the trophy.