A 4% increase in the operator’s UK online revenue was offset by a 4% fall in its international revenue for the sector.
Despite the integration of Mr Green within the trading period, William Hill attributed the international decline to "regulatory headwinds," which resulted in the operator leaving the Swiss market and caused disruption to payment methods in other areas of Europe.
Retail net revenue fell 16% for the period, with a decline of 39% in net gaming revenue and an increase of 13% in sportsbook revenue.
However, the operator said UK customers are beginning to adjust to the introduction of a £2 ($2.59) maximum stake limit to fixed-odds betting terminals earlier this year.
Net revenue increased 60% for William Hill’s US operations, with 27% growth in Nevada.
Ulrik Bengtsson, recently appointed William Hill CEO, said: "During my first months as CEO I have been focused on how we can improve our competitiveness while ensuring we continue to deliver on our strategic ambitions.
"I am pleased to confirm we remain on track to meet our full-year expectations."
