Hi there. Law.com's litigation editor Ian Lopez here with some news to help you get started for the day. Here's a look at what's under way.

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WHAT WE'RE WATCHING

BOIES BATTLE – That escalated quickly. After Boies Schiller Flexner pursued a former client, billionaire Guo Wengui, for unpaid legal fees, the exiled Chinese tycoon fired back. On New Year's Eve, Guo filed a malpractice complaint against Boies Schiller seeking $3.06 million. Guo's suit also alleges Josh Schiller, son of a firm co-founder, made repeated derogatory comments. Now it's a matter of who will budge next in litigation. David Boies said he's putting Guo and his attorneys on notice to withdraw the “frivolous” suit or get stuck with costs for filing it. Guo's attorney said that's not happening.

MUELLER MYSTERY – The U.S. Supreme Court is poised to rule soon on a grand jury subpoena dispute with apparent ties to the special counsel's Russia investigation. Chief Justice John Roberts Jr. last month temporarily stayedenforcement of a subpoena targeting an unidentified foreign-owned company that was held in contempt by Washington's chief federal trial judge. All of the documents at the high court are under seal, including the company's Jan. 2 reply brief bolstering its case against the subpoena. Stay tuned.