Millennia ago, a stone court would have hosted teams of players using their hips to knock a hard rubber ball toward goals at either end of the court. The ball game, which re-enacted a creation story recorded in the Maya religious text Popul Vuh, was a major part of political, religious, and social life for the Maya and the Aztec, and for the Olmec before them. But archaeologists don't yet know much about where people first started playing the game or how it became a cultural phenomenon that spread across the area that now includes Guatemala, Belize, Mexico, Honduras, and El Salvador.
     The ball court - a stone-floored alley about 50 meters (165 ft) long, bounded by steep stone walls and earthen mounds - once occupied a place of honor in the heart of the ancient city of Etlatongo (Mexico). But sometime between 1174 and 1102 BCE, the people of  dismantled parts of the court and ritually 'terminated' its life leaving burned bits of plant, mingled with broken pottery, animal bones, shells, and a few human bones.
     But beneath that 12th century BCE ball court lay another, even older one, dating to 1374 BCE. Archaeologists Jeffrey Blomster and Victor Salazar were surprised to find a ball court so old in the mountainous highlands of Mexico.
     The oldest known Mesoamerican ball court, which dates to 1650 BCE and has a floor of compacted earth rather than stone, is at Paso de la Amada in Chiapas, on the Pacific coast of Mexico. Until now, it looked like people didn't start building formal stone ball courts in the Mexican highlands until almost a thousand years later.
     This ball court challenges that assumption. Its presence means that by 1374 BCE, the game was already important enough to people in the highlands to occupy a prominent place in the city and justify the investment of resources it took to build a stone court. And that suggests that people in the highlands may also have played a role in developing its rules and the layout of the court. Blomster and Salazar suggest that ideas about the game may have passed among communities until it eventually coalesced into something that would have been recognized from one end of Mesoamerica to the other.
     The find also suggests that the ball game was already at the center of trade and interaction between regions. The customary equipment for the game was a hard rubber ball, and Castilla elastica rubber trees grow in the lowland coastal regions, so there must have been trade in rubber - or more likely, in rubber balls. And the connections between communities weren't just commercial.
     The earliest versions of the ball game were probably played in open fields, and informal games probably kept being played wherever there was open space for millennia, which means they didn't leave archaeological evidence behind. Communities like Etlatongo and Paso de la Amada didn't start building stone courts until the ball game became a major social and political fixture.
     Blomster and Salazar found another structure under the 1374 BCE ball court at Etlatongo. It was once a long, narrow structure, laid out in the same direction as the ball court, and it had been incorporated into the later ball court's east wall. The first ball court's layout and alignment is clearly based on the older structure's, Salazar said, but archaeologists didn't have enough time in the field to excavate enough of the older structure to say for sure whether it was an even earlier ball court.

Edited from Science Advances (13 March 2020) Ars Technica (25 March 2020)