Zhang is expected to announce that she's turning pro sometime in June.
While there have been more celebrated amateurs, like Lydia Ko, who won two LPGA tournaments as an amateur, and Michelle Wie, who was the youngest to ever qualify for an LPGA event, perhaps no one has accomplished more as an amateur and college player than Zhang.
"I liken her to Tiger," Walker said. "Tiger and Rose. They're the only two I know with emojis. Find me any other players with emojis, you're not going to find them."