The US services sector showed signs of resilience in August, with the ISM Services PMI recording its eighth straight month of expansion at 54.5, higher than July's reading of 52.7 and above economist expectations of 52.5. However, the Service PMI data measured by S&P Global was downwardly revised from an initial estimate of 51 to 50.5 in August, indicating only a marginal pace of expansion. The SPDR S&P 500 ETF Trust (NYSE:SPY) fell 0.5% amid worries that the Fed may keep a rate hike option open for the coming months.