Shares of Del Frisco’s Restaurant Group Inc. plunged 13.3% in morning trade Monday, putting them on track for the biggest one-day selloff in nearly 3 years, after the Texas-based restaurant operator reported first-quarter earnings that missed expectations. The selloff would be the second biggest since the stock went public in July 2012, behind the 17.2% drop on July 23, 2015. Earlier, the company reported net income of $400,000, or 2 cents a share, down from $3.3 million, or 14 cents a share, in the same period a year ago. Excluding non-recurring items, adjusted earnings per share came to 10 cents, missing expectations of 19 cents, according to FactSet. Revenue rose 6.5% to $89.3 million, topping the FactSet consensus of $88.4 million, while the 3.6% decline in same-store sales compared with expectations of a 5.1% drop. Separately, the company announced a deal to buy Barteca Restaurant Group, which operates Barcelona Wine Bar and Bartaco, for $325 million in cash. The stock has shed 3.3% year to date, while the S&P 500 has edged up 0.2%.