Yvonne Saunders, a Canadian track and field athlete, competed primarily in the 400 metres and 800 metres during her career. Her best performances were notable for the time and impact they had in the track and field community. Here are some highlights:

400 Metres:

• Personal Best: Yvonne Saunders' personal record for the 400 metres is approximately 51.67 seconds. This time was set during the prime of her athletic career and was a competitive mark during her time.

800 Metres:

• Personal Best: In the 800 metres, Yvonne Saunders clocked a personal best of around 2:04.29. Her performances in this event were marked by strong finishes and tactical racing.

Yvonne Saunders' achievements in these events contributed significantly to her reputation as an accomplished middle-distance runner. She competed at a high level, including representing Canada in international competitions.

For additional details and specific information, more comprehensive databases or track and field archives would be the best resources to explore. Her career timelines and full records can often be found in athletics history records or specific databases dedicated to Canadian sports achievements.