Latvia's Jelena Ostapenko took home $154,000 after winning the women's WTA 500 event by beating Veronika Kudermetova in the final last weekend.
The men's ATP 500 event, which ends this weekend, will result in the winner receiving prize money worth $773,000.
"Obviously that's a big step backwards, so it's not great," Murray said after his 7-5 6-2 loss to Jannik Sinner.
"Obviously if they're the same size events one week apart, that's quite a big discrepancy."
