This is the 16391st most frequent Turkish word.
yarıştığına
"That he/she/it competes."
In this sentence, 'yarıştığına' is used to indicate disbelief about the act of competing performed by someone.
Onun yarıştığına inanamıyorum.
I can't believe that he is competing.
Here, 'yarıştığına' suggests reasoning based on the act of competing.
Yarıştığına göre oldukça hızlı olmalı.
Considering that he is competing, he must be quite fast.
In this usage, 'yarıştığına' expresses an emotional reaction to the act of competing.