Amazon remained far and away the winner of the cloud wars in the fourth quarter of 2019, but Microsoft continued to narrow the gap as it guns for the No. 1 cloud market share position.

Now that the major providers reported their most recent quarterly results, Synergy Research Group’s data shows that Amazon maintained its 33% share of the worldwide cloud market, which mirrors overall market growth. This is despite Amazon Web Services’ slightly declining growth for the fourth consecutive quarter.

Second-place Microsoft once again grew faster than the overall cloud market and increased its share by almost 3 percentage points in the last four quarters, reaching 18%.

Behind these two market leaders, Google (8%) and Alibaba (5%) substantially outpaced overall market growth and gained market share. Both saw revenues increase by 50% or more year on year. This is the first time that parent company Alphabet released Google Cloud’s quarterly revenue as a separate line item.

No. 4 IBM, with 6% of the market, took a more focused approach that meant a lower growth rate, according to Synergy. And finally, Salesforce earned 3% market share, while Oracle, Tencent, and Rackspace each have 2%.

“The year ended with a bang as Amazon and Microsoft both posted big sequential gains in cloud revenues,” said John Dinsdale, a chief analyst at Synergy Research Group, in a statement. “Thanks to these two market leaders and strong growth from some other cloud providers, the 2019 market was over twice the size of the 2017 market. Given secular trends in the market we will continue to see strong growth. We will also see a continuing battle for market position between the global giants and smaller cloud providers that have a more focused geographic or service footprint.”

Overall, Synergy estimates that quarterly cloud infrastructure service revenues — these include infrastructure-as-a-service (Iaas), platform-as-a-service (PaaS), and hosted private cloud services — surpassed $27 billion in Q4 with full-year 2019 revenue topping $96 billion. The Q4 growth is the biggest quarterly increment the market has seen, according to Synergy.