Australia's S&P/ASX 200 index is anticipated to start the new trading month on a downward note. Ahead of Monday's opening, local stock index futures declined by 0.1%, indicating that the benchmark index is likely to open lower in early trading despite positive cues from U.S. markets. The ASX 200 index recently recorded its largest single-day gain since April 8, surging 1.6%, and closed the month with a cumulative increase of 0.8%. Investors are now likely awaiting the release of first-quarter GDP data on Wednesday before making significant bets. This data could influence the Reserve Bank of Australia's considerations on the interest rate path. Prior to the market open, imaging technology provider Pro Medicus and infrastructure services provider Ventia both announced new contracts.