This page explains how Paul Sierra (USATT# 57913)'s rating went from 1518 to 1638 at the LATTA Butterfly Patty Martinez-Wasserman Open Sept 2023 held on 30 Sep 2023 - 1 Oct 2023. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.