Tesla is facing mounting pressure as Audi, Mercedes, and Volkswagen ramp up their push into electric cars

Deliveries have begun for Audi's e-tron SUV, while pre-orders and production have started for Volkswagen's ID.3 sedan and Mercedes-Benz's EQC SUV, respectively.The e-tron, ID.3, and EQC are part of a wave of luxury and mass-market electric vehicles that have recently been released or will arrive in the coming years.Tesla accounted for about 68% of the US electric-vehicle market in 2018.But as traditional automakers ramp up their investments in electric vehicles, Tesla's position in the electric-vehicle market will be challenged.Visit Business Insider's homepage for more stories.Electric vehicles from Audi, Mercedes-Benz, and Volkswagen have reached significant milestones in recent weeks.Deliveries have begun for Audi's e-tron SUV, while pre-orders and production have started for Volkswagen's ID.3 sedan and Mercedes-Benz's EQC SUV, respectively.An Audi representative confirmed to Business Insider at the beginning of May that e-tron deliveries had started. The vehicle has a range of 204 miles, according to the Environmental Protection Agency, and starts at $74,800.Read more: Tesla analyst slashes his target again, and says everything you think you know about it is in questionVolkswagen's ID.3 has received over 15,000 pre-orders in Europe since customers were allowed to place deposits of around $1,120 for the vehicle on May 8, the company said on Tuesday. Tesla's Model 3 sedan received over 325,000 pre-orders in the first week after reservations were opened in 2016.The ID.3 will have a range of between around 200 and 340 miles, based on European testing standards, Volkswagen says. The vehicle will start at under $34,000, and deliveries will begin in mid-2020.Mercedes-Benz said EQC production had started on May 6. According to the automaker, the vehicle will have a range of over 275 miles, based on European testing standards, and start at around $80,000. EQC deliveries will begin for US customers in 2020.The e-tron, ID.3, and EQC are part of a wave of luxury and mass-market electric vehicles that have recently been released or will arrive in the coming years. Tesla accounted for about 68% of the US electric-vehicle market in 2018, and has largely had the luxury electric-vehicle market to itself since releasing its Roadster sports car in 2008. But as traditional automakers ramp up their investments in electric vehicles, Tesla's position in the electric-vehicle market will be challenged. Volkswagen plans to invest over $33 billion in electric vehicles by 2023 and introduce nearly 70 electric models by 2028. Ford plans to invest $11 billion in electric vehicles and have 40 hybrid and fully-electric models available by 2022.Tesla will likely continue to sell more electric vehicles than any of its competitors over the next two years, said Ed Kim, the vice president of industry analysis at AutoPacific. But the company's sales numbers could decline due to increased competition.“I think they're going to remain the volume leaders, at least for the next two years,” Kim said. “But I do think that their volumes will certainly drop significantly, even if they remain the market leader, simply because there's going to be a lot more competition in that space.”Have you worked for Tesla？ Do you have a story to share？ Contact this reporter at mmatousek@businessinsider.com.Read more:Lyft executive suggests drivers become mechanics after they're replaced by self-driving robo-taxisAuto stocks pop on news that Trump may delay tariffs by up to 6 monthsMost of the cells from Tesla's solar factory are going to other companies instead of being used in Tesla's solar roofWall Street's infatuation with Uber is ending — and one analyst says its stock no longer deserves a premium over Lyft