Mark Vientos opens up about ‘bite-your-head-off’ mentality, journal helping drive his Mets success

Amazin’ third baseman Mark Vientos, nicknamed “Swaggy V.,” takes a swing at some Q&A with Post columnist Steve Serby. Q: Describe your mentality on the field. A: I’m a competitor. I want to be the best out there, I want to be the best for my team. I want to win. … I am confident....